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1. (n.) gabbro
a dark granular igneous rock composed essentially of labradorite and augite.
Etymology: (1835–40;< It; akin to L glaber smooth)
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Princeton's WordNet |
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1. (noun) gabbro
one of a family of granular intrusive rocks
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Webster Dictionary |
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1. (noun) gabbro
a name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro)
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Definitions of gabbro 
