macropinacoid
1 definition found
macropinacoid - Collaborative International Dictionary of English v.0.48 :
Macropinacoid \Mac`ro*pin"a*coid\, n. [Macro- + pinacoid.]
(Crystallog.)
One of the two planes of an orthorhombic crystal which are
parallel to the vertical and longer lateral (macrodiagonal)
axes.
[1913 Webster]
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