tetrahedron: Meaning and Definition of

tet•ra•he•dron

Pronunciation: (te"tru-hē'drun), [key]
— pl. -drons, -dra
  1. a solid contained by four plane faces; a triangular pyramid.
  2. any of various objects resembling a tetrahedron in the distribution of its faces or apexes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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