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dolerite

[dol-uh-rahyt]
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noun Petrology.
  1. a coarse-grained variety of basalt.
  2. any of various other igneous rocks, as diabase.
  3. any basaltlike igneous rock whose composition can be determined only by microscopic examination.

Origin of dolerite

1830–40; < French dolérite < Greek doler(ós) deceitful (derivative of dólos wile) + French -ite -ite1
Related formsdol·er·it·ic [dol-uh-rit-ik] /ˌdɒl əˈrɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dolerite

dolerite

noun
  1. a dark basic intrusive igneous rock consisting of plagioclase feldspar and a pyroxene, such as augite; often emplaced in dykes
  2. any dark igneous rock whose composition cannot be determined with the naked eye
Derived Formsdoleritic (ˌdɒləˈrɪtɪk), adjective

Word Origin

C19: from French dolérite, from Greek doleros deceitful; so called because of the difficulty of determining its composition
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

dolerite in Science

dolerite

[dŏlə-rīt′]
  1. See diabase.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.