Octahedron

• POS: Noun
• HYPHEN: oc=ta=he=dron

CIDE DICTIONARY

Octahedron, n. [Gr., fr. eight-side; 'okta- (for 'oktw` eight) + seat, base, from to sit.].

 A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.  [1913 Webster]

OXFORD DICTIONARY

Octahedron, n. (pl. octahedrons or octahedra)
1 a solid figure contained by eight (esp. triangular) plane faces.
2 a body, esp. a crystal, in the form of a regular octahedron.

Idiom

regular octahedron an octahedron contained by equal and equilateral triangles.

Derivative

octahedral adj.

Etymology

Gk oktaedron (as OCTA-, -HEDRON)

ROGET THESAURUS

Octahedron

Angularity

N angularity, angularness, aduncity, angle, cusp, bend, fold, notch, fork, bifurcation, elbow, knee, knuckle, ankle, groin, crotch, crutch, crane, fluke, scythe, sickle, zigzag, kimbo, akimbo, corner, nook, recess, niche, oriel, coign, right angle, obliquity, angle of 45 degrees, miter, acute angle, obtuse angle, salient angle, reentering angle, spherical angle, angular measurement, angular elevation, angular distance, angular velocity, trigonometry, goniometry, altimetry, clinometer, graphometer, goniometer, theodolite, sextant, quadrant, dichotomy, triangle, trigon, wedge, rectangle, square, lozenge, diamond, rhomb, rhombus, quadrangle, quadrilateral, parallelogram, quadrature, polygon, pentagon, hexagon, heptagon, octagon, oxygon, decagon, pyramid, cone, Platonic bodies, cube, rhomboid, tetrahedron, pentahedron, hexahedron, octahedron, dodecahedron, icosahedron, eicosahedron, prism, pyramid, parallelopiped, curb roof, gambrel roof, mansard roof, angular, bent, crooked, aduncous, uncinated, aquiline, jagged, serrated, falciform, falcated, furcated, forked, bifurcate, zigzag, furcular, hooked, dovetailed, knock kneed, crinkled, akimbo, kimbo, geniculated, oblique, fusiform, wedge-shaped, cuneiform, cuneate, multangular, oxygonal, triangular, trigonal, trilateral, quadrangular, quadrilateral, foursquare, rectangular, square, multilateral, polygonal, cubical, rhomboid, rhomboidal, pyramidal.