porphyroid Hear it!

porphyroid definition

por·phy·roid (pôr′fə ro̵id′)

noun

a metamorphic rock having large crystals embedded in a fine-grained matrix of either igneous or sedimentary origin

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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