Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of macropinacoid is as below...

Macroprism :: Macroprism (n.) A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.

Macropinacoid :: Macropinacoid (n.) One of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.

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