nounWord forms: plural ˈporphyries
rock with large feldspar crystals contained in a purplish groundmass
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
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Word origin of 'porphyry'ME porfirie < OFr porfire < ML porphyreum, altered < L porphyrites < Gr porphyritēs (lithos), lit., purple (stone) < porphyros, purple