'Brachypinacoid' definitions:

Definition of 'Brachypinacoid'

From: GCIDE

Brachypinacoid \Brach`y*pin"a*coid\, n. [Gr. brachy`s short + E. pinacoid.] (Crytallog.) A plane of an orthorhombic crystal which is parallel both to the vertical axis and to the shorter lateral (brachydiagonal) axis. [1913 Webster]