## tetrahedra

Noun

- plural form of
*tetrahedron*

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- The bisphenoids (the hemihedral forms of the tetragonal and rhombic bipyramids)., and the trigonal pyramid of the hexagonal system, are examples of non-regular
**tetrahedra**(see Crystallography). - Arrangements connected with Claus' formula are obtained by placing six
**tetrahedra**on the six triangles formed by the diagonals of a plane hexagon. - The form in which the
**tetrahedra**are all on one side, afterwards discussed by J. - Loschmidt (Monats., 1890, II, p. 28), would not give stereo-isomers; and the arrangement of placing the
**tetrahedra**on alternate sides, a form afterwards developed by W. - Two parallel triangular faces are removed from a cardboard model of a regular octahedron, and on the remaining six faces
**tetrahedra**are then placed; the hydrogen atoms are at the free angles.

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