noun, plural tet·ra·he·drons, tet·ra·he·dra [te-truh-hee-druh]. /ˌtɛ trəˈhi drə/.
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Example sentences from the Web for tetrahedron
The atoms are arranged in two tetrahedra with a common apex, and the relationship is maintained in the meta-body, a septet.
The globe, e, is a new form, the four tetrahedra of the proto level making a single twelve-atomed one on the meta.
The smallest particles of fire are tetrahedra, of air octahedra, of water icosahedra.A Critical History of Greek Philosophy|W. T. Stace