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porphyroid

 - 2 dictionary results

por⋅phy⋅roid

  [pawr-fuh-roid]
Use porphyroid in a Sentence
–noun
1. a rock resembling porphyry.
2. a sedimentary rock that has been metamorphosed so as to leave some original crystals in a fine-textured, layered matrix.
Origin:
1790–1800; porphyr(y) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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por·phy·roid   (pôr'fə-roid')   
n.  Metamorphic rock having porphyritic texture.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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