• synonyms


adjective Petrology.
  1. of, pertaining to, containing, or resembling porphyry, its texture, or its structure.
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Origin of porphyritic

1375–1425; late Middle English porphiritike < Medieval Latin porphyrīticus < Greek porphyrītikós of porphyry; see -ic
Related formsnon·por·phy·rit·ic, adjectivepseu·do·por·phy·rit·ic, adjectivesub·por·phy·rit·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for porphyritic

Historical Examples

  • Long before this it existed as a slate and porphyritic line of hills.

    More Letters of Charles Darwin

    Charles Darwin

  • In the main the lava is an andesite, and is very generally of a porphyritic structure.

  • The soil, in fact, was bestrewn with quartz and porphyritic rocks.

  • Page 40: "porphorytic" changed to "porphyritic" (the greenstone is handsomely porphyritic).

    Western Scenes and Reminiscences

    Henry Rowe Schoolcraft

  • From two to three feet of mighty greenstone penetrate these porphyritic rocks.

British Dictionary definitions for porphyritic


  1. (of rocks) having large crystals in a fine groundmass of minerals
  2. consisting of porphyry
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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

porphyritic in Science


  1. An igneous rock containing the large crystals known as phenocrysts embedded in a fine-grained matrix.
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Related formsporphyritic adjective (pôr′fə-rĭtĭk)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.