noun Crystallography.
a form whose faces are parallel to two of the axes.

1875–80; < Greek pinak- (stem of pínax) slab, board + -oid

pinacoidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences for pinacoid
It has four prism faces and two pinacoid faces to form a pseudohexagonal crystal.
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