[ per-i-doh-tahyt, puh-rid-uh-tahyt ]
/ ˈpɛr ɪˌdoʊ taɪt, pəˈrɪd əˌtaɪt /


a coarsely granular igneous rock composed chiefly of olivine with an admixture of various other minerals.

Origin of peridotite

From French, dating back to 1895–1900; see origin at peridot, -ite1

Related forms

per·i·do·tit·ic [per-i-doh-tit-ik, puh-rid-uh-] /ˌpɛr ɪ doʊˈtɪt ɪk, pəˌrɪd ə-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for peridotite

British Dictionary definitions for peridotite


/ (ˌpɛrɪˈdəʊtaɪt) /


a dark coarse-grained ultrabasic plutonic igneous rock consisting principally of olivine

Derived Forms

peridotitic (ˌpɛrɪdəʊˈtɪtɪk), adjective

Word Origin for peridotite

C19: from French, from peridot
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

Science definitions for peridotite


[ pĕrĭ-dō-tīt′, pə-rĭdə- ]

A coarse-grained igneous rock that consists mainly of olivine and pyroxene. It is believed to be one of the main constituent rocks of the Earth's mantle.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.