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porphyroid

[pawr-fuh-roid] /ˈpɔr fəˌrɔɪd/
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 of porphyroid
1790-1800
1790-1800; porphyr(y) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for porphyroid
Historical Examples
  • Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.

British Dictionary definitions for porphyroid

porphyroid

/ˈpɔːfɪˌrɔɪd/
adjective
1.
(of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmass
noun
2.
a metamorphic rock having this texture
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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