The Collaborative International Dictionary
Macroprism
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.
Wiktionary
macroprism
n. A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.