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Related to gabbro: obsidian
n. pl. gab·bros
A usually coarse-grained igneous rock composed chiefly of pyroxene and calcic plagioclase feldspar. Also called norite.
[Italian, perhaps from Latin glaber, bald, beardless.]
gab·bro′ic (gă-brō′ĭk), gab′broid′ (găb′roid′) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -bros
(Minerals) 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]
gabˈbroic, ˌgabbroˈitic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. -bros.
a dark granular igneous rock composed essentially of labradorite and augite.
[1835–40;< Italian; akin to Latin glaber smooth]
gab•bro•ic (gəˈbroʊ ɪk) gab`bro•it′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A usually dark, coarse-grained igneous rock composed mostly of plagioclase and pyroxene. It is mineralogically similar to basalt but has larger crystals. See Table at rock.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A dense, dark, coarse-grained, intrusive igneous rock that largely consists of feldspar and pyroxene.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited