Geom. [f. TETRA- + HEXAHEDRON.] A solid figure contained by twenty-four planes. † a. See quots. 1805–17, 1860. Obs. b. = TETRAKIS-HEXAHEDRON. Hence Tetrahexahedral a., pertaining to, or having the form of, a tetrahexahedron.
1805–17. R. Jameson, Char. Min. (ed. 3), 204. [A crystal is] tetrahexahedral … when its surface consists of … four … ranges of planes, disposed six and six above each other.
1828. Webster, Tetrahexahedral, in crystalography, exhibiting four ranges of faces, one above another, each range containing six faces. Ibid. (1847), Tetrahexahedron, a solid bounded by twenty-four equal faces, four corresponding to each face of the cube.
1860. Mayne, Expos. Lex., Tetrahexahedron,… a figure having four ranges of bases, or faces, six in each range.
