Now updated for CSW19. New words, if any, and new inflections of existing words, are shown in red.
agonic | making no angle. |
antiparallel | making with a transverse line an internal angle equal to the external angle made by another line; (noun) an antiparallel line. |
apothem | (Greek) the perpendicular from the centre of a regular polygon to any of its sides. |
arc | a part of the circumference of a circle or other curve; (verb) to form an arc. |
arccosine | a mathematical function. |
arcmin | 1/60 of a degree of angle. |
arcminute | a unit of angular measurement, one sixtieth of a degree. |
arcsec | a unit of angle measurement, 1/3600 of a degree. |
arcsine | a geometrical ratio. |
arctangent | a geometrical ratio. |
asymmetry | lack of symmetry. |
axis | (Lat.) the imaginary straight line about which a body such as the earth rotates the white-spotted deer of India |
axised | having an axis. |
bilinear | of or involving two lines. |
bisector | one who, or that which, bisects; esp in geometry a straight line which bisects an angle. |
brachypinakoid | a pinakoid or prism parallel to the brachydiagonal. |
brachyprism | a prism parallel to the brachydiagonal. |
catenoid | the surface generated by rotating a catenary about its axis. |
cathetus | (Greek) a straight line perpendicular to another straight line or surface. |
chiliagon | (Greek) a plane figure of a thousand angles and sides. |
chiliahedron | (Greek) a one-thousand sided solid figure. |
circumcenter | the point at which the perpendicular bisectors of the sides of a triangle intersect and which is equidistant from the three vertices. |
circumcentre | the point at which the perpendicular bisectors of the sides of a triangle intersect and which is equidistant from the three vertices. |
circumcircle | a circle which passes through all the vertices of a polygon, such as a triangle. |
coaxial | having the same axis. |
coaxially | (Adv.) COAXIAL, having the same axis. |
cofunction | a kind of trigonometric function. |
colinear | in the same straight line. |
colinearity | the state of being colinear. |
collimation | the act of making parallel. |
collinear | in the same straight line. |
collinearly | (Adv.) COLLINEAR, in the same straight line. |
conic | cone-shaped, conical (noun) a conic section |
conoidic | nearly, but not exactly, conical. |
conoidical | nearly, but not exactly, conical. |
coplanar | on the same plane. |
coplanarity | the state of being coplanar. |
cosec | (Short for) cosecant, the secant of the complement of an arc or angle. |
cosecant | the secant of the complement of an arc or angle. |
cosech | (Short for) hyberbolic cosecant. |
cosine | a trigonometric function of an angle. |
cotan | (Short for) cotangent, the tangent of the complement of an arc or angle. |
cotangent | the tangent of the complement of an arc or angle. |
coth | (Short for) hyperbolic cotangent. |
coversed | as in coversed sine, an obsolete function in trigonometry. |
coversine | a function in trigonometry. |
crunodal | relating to a crunode, the point at which a curve crosses itself. |
crunode | the point at which a curve crosses itself. |
cubage | the process of finding the cubic content of a body. |
cubature | the determination of the cubic content of a solid. |
cubic | in the form of a cube (noun) a cubic equation |
cubicly | (Adv.) CUBIC, in the form of a cube. |
decagon | a plane figure with ten equal sides. |
decagonal | of a plane figure, having ten sides. |
decagonally | (Adv.) DECAGONAL, of a plane figure, having ten sides. |
decahedral | having ten sides. |
decahedron | a solid figure or body inclosed by ten plane surfaces. |
declinator | an instrument for taking the declination or angle which a plane makes with the horizontal plane. |
diallel | meeting and intersecting, as lines; not parallel; (noun) a scheme of cross-breeding within a select group of parents, designed to produce various hybrids with different genetic properties. |
diameter | a straight line passing through the center of a circle and ending at the periphery. |
diametral | pertaining to a diameter. |
diametrally | (Adv.) DIAMETRAL, pertaining to a diameter. |
diametric | pertaining to a diameter. |
diametrical | pertaining to a diameter. |
diametrically | (Adv.) DIAMETRICAL, pertaining to a diameter. |
diedral | bounded by two planes, or two plane faces; (noun) a diedral angle. |
digonal | of symmetry about an axis, such that a half-turn (180°) gives the same figure. |
digoxin | a drug used to improve heart function. |
dihedral | bounded by two planes, or two plane faces; (noun) a dihedral angle. |
dihedron | a figure with two sides or surfaces. |
dodecagon | a plane figure with twelve sides. |
dodecagonal | like a dodecagon, a plane figure with twelve sides. |
dodecahedral | relating to a dodecahedron, a twelve-sided solid figure. |
dodecahedron | (Greek) a twelve-sided solid figure. |
ellipsoid | a solid, all plane sections of which are ellipses or circles. |
endecagon | an eleven-sided polygon. |
enneagon | a polygon with nine sides. |
enneagonal | belonging to an enneagon; having nine angles. |
enneahedral | of or like an enneahedron, a nine-sided solid figure. |
enneahedron | a nine-sided solid figure. |
epicycle | a circle whose centre moves round the circumference of a larger circle. |
epicyclic | pertaining to or having the motion of, an epicycle. |
epicyclical | pertaining to or having the motion of, an epicycle. |
equilateral | having all sides equal (noun) a shape with all sides equal |
equilaterally | (Adv.) EQUILATERAL, having all sides equal. |
escribe | to draw a circle so as to touch one side of a triangle externally; the others (produced) internally. |
euclidean | related to Euclid, or to the geometry of Euclid. |
euclidian | related to Euclid, or to the geometry of Euclid. |
exsecant | a trigonometric function of an angle. |
fractal | generated by successive subdivisions of a simpler polygon or polyhedron, according to some iterative process; (noun) a fractal shape. |
fractality | the state of being fractal. |
frustum | (Lat.) a slice of a solid body; the part of a cone or pyramid between the base and a parallel plane. |
generant | a thing which generates; spec. in maths a generatrix. |
generatrix | a line, point or figure that traces out another figure by its motion. |
geometrically | (Adv.) GEOMETRICAL, related to geometry. |
gon | a geometrical grade. |
haversine | half the versed sine of an angle. |
hemicycle | a half circle; a semicircle. |
hendecagon | an eleven-sided polygon. |
hendecagonal | of or like a hendecagon, an eleven-sided polygon. |
hendecahedron | a solid figure having 11 plane faces. |
heptagon | a seven-sided plane figure. |
heptagonal | having seven angles or sides. |
heptahedral | like a heptahedron. |
heptahedron | a solid figure having several plane faces. |
heptangular | having seven angles. |
hexagon | a six-sided plane figure. |
hexagonal | having six sides and six angles. |
hexagonally | (Adv.) HEXAGONAL, having six sides and six angles. |
hexagram | a figure of six lines, esp a stellate hexagon, aka Star of David. |
hexahedral | in the form of a hexahedron. |
hexahedron | a solid body of six sides or faces. |
holohedral | having all the planes required by complete symmetry, as opposed to hemihedral. |
holohedrism | the property of having the full number of symmetrically arranged planes crystallographically possible. |
holohedron | a geometrical form possessing the property of holohedrism. |
homaloid | a Euclidean space, analogous to a plane. |
homaloidal | of the nature of a homaloid; flat; plane-shaped. |
homoeomorphic | of two geometrical figures, such that one can be converted into the other by distortion. |
homoeomorphism | the state of being homoeomorphic. |
hyperboloid | a solid figure in which some of the plane sections are hyperbolas. |
hyperboloidal | of or like a hyperboloid. |
hypercube | a figure in a space of four or more dimensions having all its sides equal and all its angles right angles. |
hyperplane | a figure in hyperspace corresponding to a plane in ordinary space. |
hyperspace | an imagined space having more than three dimensions. |
hyperspatial | relating to hyperspace, an imagined space having more than three dimensions. |
hypotenuse | the longest side of a right-angled triangle. |
hypothenuse | the longest side of a right-angled triangle. |
icosahedral | of or having the form of an icosahedron. |
icosahedron | a polyhedron having 20 faces. |
icositetrahedra | solid figures with twenty-four plane faces. |
incenter | the centre of an inscribed circle or sphere. |
incentre | the centre of an inscribed circle or sphere. |
interradial | between radii or rays. |
interradially | (Adv.) INTERRADIAL, between radii or rays. |
interradius | a radius midway between primary radii or perradii. |
isogon | an equiangular polygon. |
isoperimeter | a figure with perimeter equal to another. |
isoperimetry | the state of being isoperimetrical. |
isosceles | a triangle with two equal sides. |
manifolder | one who makes manifolds. |
nonagon | a nine-sided figure. |
nonagonal | with nine angles. |
nonvector | something that is not a vector. |
obconical | conical, but having the apex downward; inversely conical. |
octagon | an eight-sided plane figure. |
octagonal | having eight sides and eight angles. |
octagonally | (Adv.) OCTAGONAL, having eight sides and eight angles. |
octahedral | having eight faces or sides. |
octahedrally | (Adv.) OCTAHEDRAL, having eight faces or sides. |
octahedron | (Greek) a solid bounded by eight plane faces. |
octangle | an octagon. |
octangular | having eight angles. |
octant | the eighth part of circle (45°); an angle-measuring instrument with that arc. |
octantal | relating to an octant, the eighth part of circle (45°). |
octohedron | (Greek) a solid bounded by eight plane faces. |
orthocenter | the point of intersection of the altitudes of a triangle. |
orthocentre | the point of intersection of the altitudes of a triangle. |
orthogonal | at right angles; unrelated or independent of each other. |
orthogonality | the state of being orthogonal. |
orthogonally | (Adv.) ORTHOGONAL, right-angled. |
paraboloid | a surface or solid generated by the rotation of a parabola about its axis. |
paraboloidal | of or like a paraboloid. |
parallelogram | a quadrilateral with opposite sides parallel and equal. |
parallelopiped | a solid figure bounded by six parallelograms, opposite pairs being identical and parallel. |
parallelwise | in parallel fashion. |
pentagon | a five-sided plane figure. |
pentagonal | having five corners or angles (noun) a pentagonal shape |
pentagonally | (Adv.) PENTAGONAL, having five corners or angles. |
pentahedral | of or like a pentahedron, a five-sided solid figure. |
pentahedron | a five-sided solid figure. |
perigon | (Greek) an angle of 360 degrees. |
perimeter | the circuit or boundary of any plane figure. |
perpendicular | at right angles to a line or plane (noun) a perpendicular line |
planar | relating to a plane, lying in a single plane. |
planarity | the property of being planar, lying in a single plane. |
planate | having a flat surface. |
polar | relating to a pole; (noun) a term in geometry. |
polyaxial | a shape having many axes or several axis cylinders. |
polyaxon | having many axes or several axis cylinders; (noun) a figure with many axes. |
polyconic | pertaining to, or based upon, many cones. |
polygon | (Greek) a plane figure bounded by straight lines, esp more than four. |
polyhedral | having many faces or planes. |
polyhedric | having many faces or planes. |
polyhedron | a body or solid contained by many sides or planes. |
polyomino | a flat, many-sided shape made of up of identical squares placed side by side. |
porism | (Greek) the geometric proposition that it is possible, in certain conditions, for a problem to have any number of solutions. |
porismatic | relating to a porism, the geometric proposition that it is possible, in certain conditions, for a problem to have any number of solutions. |
porismatical | relating to a porism, the geometric proposition that it is possible, in certain conditions, for a problem to have any number of solutions. |
poristic | relating to a porism, the geometric proposition that it is possible, in certain conditions, for a problem to have any number of solutions. |
poristical | relating to a porism, the geometric proposition that it is possible, in certain conditions, for a problem to have any number of solutions. |
prism | (Greek) a solid figure of which the two ends are similar, equal, and parallel rectilineal figures, and the sides parallelograms. |
prismoid | a body that approaches to the form of a prism. |
prismoidal | having the form of a prismoid. |
prismy | pertaining to a prism. |
pyritohedral | of or like a pyritohedron, a pentagonal dodecahedron. |
pyritohedron | a pentagonal dodecahedron. |
quadrant | a quarter circumference of circle; an instrument for measuring altitudes. |
quadrantal | of or pertaining to a quadrant. |
quadrature | the finding of a square having the same area as some given curvilinear figure. |
quadrilateral | a polygon of four sides. |
quindecagon | a geometric figure having fifteen sides and fifteen angles. |
rabat | (Fr.) to rotate into coincidence with another plane. |
rabatment | rotation into coincidence with another plane. |
rabatte | (Fr.) to rotate into coincidence with another plane. |
rabatting | the act of rabatting. |
radiant | shining (noun) a straight line from a point about which it is conceived to revolve |
radiantly | (Adv.) RADIANT, shining. |
rectangle | a four-sided plane figure with all its angles right angles, esp one with unequal adjacent sides. |
rectilineal | moving in or forming a straight line. |
rectilineally | (Adv.) RECTILINEAL, moving in or forming a straight line. |
rectilinear | moving in or forming a straight line. |
rectilinearity | the state of being rectilinear. |
rectilinearly | (Adv.) RECTILINEAR, moving in or forming a straight line. |
rhomb | an equilateral parallelogram. |
rhombic | of or like a rhombus, an equilateral parallelogram. |
rhombical | of or like a rhombus, an equilateral parallelogram. |
rhombohedral | shaped like a rhombohedron. |
rhombohedron | a parallelepiped whose faces are rhombuses. |
rhomboid | a parallelogram with unequal sides. |
rhomboidal | having, or approaching, the shape of a rhomboid. |
rhomboides | a rhomboid. |
rhomboideus | a rhomboid. |
rhombus | (Lat.) an equilateral parallelogram. |
scalene | of a triangle, having three unequal sides; (noun) the scalene muscle or scalenus. |
scalenohedron | a hemihedral form bounded in the hexagonal system by twelve, in the tetragonal by eight, faces, each a scalene triangle. |
sech | a hyperbolic secant. |
sectoral | of or pertaining to a sector; as, a sectoral circle. |
semiangle | the half of a given, or measuring, angle. |
semicircle | the half of a circle. |
semicircled | enclosed within a semicircle. |
semidiameter | half the diameter, esp the angular diameter. |
semiperimeter | half the perimeter. |
simplex | (Lat.) a geometrical term, a figure with a minimum number of vertices. |
simplicial | of or relating to simplexes. |
simplicially | (Adv.) SIMPLICIAL, of or relating to simplexes. |
sinh | a hyperbolic function of an angle. |
sinical | of or pertaining to a sine. |
square | having four equal sides and four right angles; rigidly conventional (noun) a shape with four equal sides and four right angles; (verb) to make square |
squarely | (Adv.) SQUARE, having four equal sides and four right angles. |
subparallel | almost parallel. |
subtangent | the part of the axis contained between the ordinate and tangent drawn to the same point in a curve. |
subtend | to be opposite to or to extend under. |
subtense | a line subtending, or stretching across; a chord; as, the subtense of an arc. |
symmetral | of symmetry. |
tangent | a line that touches a curve. |
tangental | of or pertaining to the nature of a tangent. |
tangentally | in the direction of a tangent. |
tangential | of or pertaining to the nature of a tangent. |
tanh | (Short for) a hyperbolic tangent. |
tesseract | a figure of a cube within a cube. |
tetartohedral | having one fourth the number of planes required by complete symmetry. |
tetartohedrally | (Adv.) TETARTOHEDRAL, having one fourth the number of planes required by complete symmetry. |
tetartohedrism | the state of being tetartohedral, having one fourth the number of planes required by complete symmetry. |
tetragon | a plane figure with four angles and four sides. |
tetragonal | of or pertaining to a tetragon. |
tetragonally | (Adv.) TETRAGONAL, of or pertaining to a tetragon. |
tetrahedral | of a solid with four sides. |
tetrahedrally | (Adv.) TETRAHEDRAL, of a solid with four sides. |
tetrahedron | a polyhedron that has four faces. |
tore | a surface described by rotation of conic section about a line. |
toroidal | like a toroid, shaped like a doughnut or anchor-ring. |
toroidally | (Adv.) TOROIDAL, like a toroid, shaped like a doughnut or anchor-ring. |
tractrix | a curve such that the intercept of a tangent by a fixed straight line is constant. |
trapezial | like a trapezium. |
trapeziform | in the form of a trapezoid quadrilateral with no sides parallel. |
trapezium | (Lat.) a quadrilateral with two parallel sides. |
trapezoidal | in the form of a trapezium. |
triangle | a polygon having three sides. |
triangled | having a triangle. |
trigon | a figure having three angles; a triangle. |
trigonal | pertaining to or having three angles. |
trigonally | (Adv.) TRIGONAL, pertaining to or having three angles. |
trigonic | pertaining to or having three angles. |
trigonometric | relating to trigonometry. |
trigonometrical | relating to trigonometry. |
trigonometry | the study of the properties of triangles and trigonometric functions and of their applications. |
trihedral | a solid having three sides or faces; thus, a trihedral angle is a solid angle bounded by three plane angles. |
trihedron | a figure having three sides. |
trisoctahedron | a solid figure having 24 congruent faces and an octahedron as a base. |
tromino | a flat, three-sided shape made up of a number of identical squares placed edge to edge. |
twistor | a complex variable representing spacetime coordinates. |
undecagon | a polygon having eleven sides. |
vectorial | of or like a vector. |
vectorially | (Adv.) VECTORIAL, of or like a vector. |
vectorise | to make into a vector. |
vectorize | to make into a vector. |
versin | a versed sine. |
versine | a versed sine. |
vertex | (Lat.) a point, as of an angle or polygon. |