gabbro

noun gab·bro \ˈga-(ˌ)brō\

plural gabbros

Definition of GABBRO

: a granular igneous rock composed essentially of calcic plagioclase, a ferromagnesian mineral, and accessory minerals

— gab·bro·ic \ga-ˈbrō-ik\ adjective

Italian, probably modification of Latin glaber smooth — more at glad

First Known Use: circa 1828

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