Main Entry: gab·bro

Pronunciation: \ˈga-(ˌ)brō\

Function: noun

Inflected Form(s): plural gabbros

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

Date: circa 1828

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

— gab·bro·ic \ga-ˈbrō-ik\ adjective