porphyroid

[ pawr-fuh-roid ]

/ ˈpɔr fəˌrɔɪd /

noun

a rock resembling porphyry.

a sedimentary rock that has been metamorphosed so as to leave some original crystals in a fine-textured, layered matrix.

Nearby words

porphyritic, porphyrization, porphyrize, porphyroblast, porphyrogenite, porphyroid, porphyropsin, porphyry, porpoise, porrect, porridge

Origin of porphyroid

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for porphyroid

Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.
The Andes and the Amazon|James Orton

British Dictionary definitions for porphyroid

porphyroid

/ (ˈpɔːfɪˌrɔɪd) /

adjective

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

noun

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