Macroprism :: Macroprism (n.) A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.
Prism :: Prism (n.) A solid whose bases or ends are any similar, equal, and parallel plane figures, and whose sides are parallelograms..
Prism :: Prism (n.) A transparent body, with usually three rectangular plane faces or sides, and two equal and parallel triangular ends or bases; -- used in experiments on refraction, dispersion, etc..
Prism :: Prism (n.) A form the planes of which are parallel to the vertical axis. See Form, n., 13..