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gabbro

[gab-roh] /ˈgæb roʊ/
noun, plural gabbros. Petrology
1.
a dark granular igneous rock composed essentially of labradorite and augite.
Origin
< Italian; akin to Latin glaber smooth
Related forms
gabbroic
[guh-broh-ik] /gəˈbroʊ ɪk/ (Show IPA),
gabbroitic, adjective
gabbroid
[gab-roid] /ˈgæb rɔɪd/ (Show IPA),
adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for gabbroic

gabbro

/ˈɡæbrəʊ/
noun (pl) -bros
1.
a dark coarse-grained basic plutonic igneous rock consisting of plagioclase feldspar, pyroxene, and often olivine
Derived Forms
gabbroic, gabbroitic, adjective
Word Origin
C19: from Italian, probably from Latin glaber smooth, bald
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for gabbroic

gabbro

n.

type of igneous rock, 1837, from Italian (Tuscan) gabbro, from Latin glaber "bare, smooth, bald" (see glad).

Online Etymology Dictionary, © 2010 Douglas Harper
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gabbroic in Science
gabbro
  (gāb'rō)   
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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