tetrahedron

tet·ra·he·dron Audio Help (tět'rə-hē'drən)

n. pl. tet·ra·he·drons or tet·ra·he·dra (-drə)
A polyhedron with four faces.

[Late Greek tetraedron, from Greek, neuter of tetraedros, four-faced : tetra-, tetra- + hedrā, face of a geometric solid; see sed- in Indo-European roots.]

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