HEMIHEDRAL

Etymology

Adjective

hemihedral (not comparable)

(of a crystal) Having only half the plane faces needed for the highest degree of symmetry in its system

Source: Wiktionary

Hem`i*he"dral, a. Etym: [Hemi- + Gr. (Crystallog.)

Definition: Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron.

– Hem`i*he"dral*ly, adv.

Source: Webster’s Unabridged Dictionary 1913 Edition

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