pinacoid

[ pin-uh-koid ]
/ ˈpɪn əˌkɔɪd /

noun Crystallography.

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

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Mississippi’s nickname comes from the magnificent trees that grow there. What is it?

Origin of pinacoid

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

OTHER WORDS FROM pinacoid

pin·a·coi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020