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pinacoid

[pin-uh-koid]
noun Crystallography.
  1. a form whose faces are parallel to two of the axes.
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Origin of pinacoid

1875–80; < Greek pinak- (stem of pínax) slab, board + -oid
Related formspin·a·coi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018