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gabbro

 - 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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Word Origin & History

gabbro 
"type of igneous rock," 1837, from It. (Tuscan), from L. glaber "bare, smooth, bald."
Online Etymology Dictionary, © 2001 Douglas Harper
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