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English Dictionary | pinacoid

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pinacoid

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WordReference Random House Unabridged Dictionary of American English © 2026

pin•a•coid n. [Crystall.]

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

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

pin′a•coi′dal, adj.

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