macropinacoid (plural macropinacoids)
- One of the two planes of an orthorhombic crystal which are parallel to the vertical and longer lateral (macrodiagonal) axes.
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for macropinacoid in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)