'Macroprism' definitions:

Definition of 'Macroprism'

From: GCIDE

Macroprism \Mac"ro*prism\, n. [Macro- + prism.] (Crystallog.) A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids. [1913 Webster]