n.
Pronunciation: ' ga-( ˌ )br ō
Function: noun
Inflected Form: 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- ' br ō -ik \ adjective