gabbro

[gab-roh]
noun, plural gabbros. Petrology.
a dark granular igneous rock composed essentially of labradorite and augite.

Origin:
< Italian; akin to Latin glaber smooth

gabbroic [guh-broh-ik] , gabbroitic, adjective
gabbroid [gab-roid] , adjective
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World English Dictionary
gabbro (ˈɡæbrəʊ)
 
n , pl -bros
a dark coarse-grained basic plutonic igneous rock consisting of plagioclase feldspar, pyroxene, and often olivine
 
[C19: from Italian, probably from Latin glaber smooth, bald]
 
gab'broic
 
adj
 
gabbro'itic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

gabbro
"type of igneous rock," 1837, from It. (Tuscan), from L. glaber "bare, smooth, bald."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
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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Example sentences
Hornblende gabbro locally intrudes and is mapped with the diorite.
Trees grow only on the gabbro and the contact between the two rocks can be detected by the tree line.
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