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porphyroid

[ pawr-fuh-roid ]

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.


porphyroid

/ ˈpɔːfɪˌrɔɪd /

adjective

  1. (of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmass
“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


noun

  1. 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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Word History and Origins

Origin of porphyroid1

First recorded in 1790–1800; porphyr(y) + -oid
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Example Sentences

Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.

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porphyrogeniteporphyropsin