dolerite

[dol-uh-rahyt]
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noun Petrology.

a coarse-grained variety of basalt.
any of various other igneous rocks, as diabase.
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. 2019

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British Dictionary definitions for dolerite

dolerite

noun

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

Word Origin for dolerite

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′]

See diabase.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.