Gabbroid

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
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