Tetrahedron

[,tetrə'hiːdrən;-'hed-] or [,tɛtrə'hidrən]

Definition

(noun.) any polyhedron having four plane faces.

Edited by Elena--From WordNet

Definition

(n.) A solid figure inclosed or bounded by four triangles.

Typist: Patricia

Definition

n. a solid figure enclosed by four bases or triangles.—adjs. Tetrahē′dral having four sides: bounded by four triangles; Tetrahexahē′dral.—n. Tetrahex′ahēdron a solid of twenty-four triangular faces.

Checker: Rita