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gabbroid

 - 3 dictionary results

gab⋅bro

  [gab-roh]
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–noun, plural -bros. Petrology.
a dark granular igneous rock composed essentially of labradorite and augite.
Origin:
< It; akin to L glaber smooth

Related forms:
gab⋅bro⋅ic  [guh-broh-ik] , gab⋅bro⋅it⋅ic, adjective
gab⋅broid  [gab-roid] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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gab·bro   (gāb'rō)   
n.   pl. gab·bros
A usually coarse-grained igneous rock composed chiefly of calcic plagioclase and pyroxene. Also called norite.

[Italian, perhaps from Latin glaber, bald, beardless.]
gab·bro'ic (gā-brō'ĭk), gab'broid' (gāb'roid') adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
gabbro   (gāb'rō)  Pronunciation Key 
A usually dark, coarse-grained igneous rock composed mostly of plagioclase feldspar and clinopyroxene, and sometimes olivine. Gabbro is the coarse-grained equivalent of basalt.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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