Definitions for gabbroˈgæb roʊ
Random House Webster's College Dictionary
a dark granular igneous rock composed essentially of labradorite and augite.
Origin of gabbro:
1835–40;< It; akin to L glaber smooth
one of a family of granular intrusive rocks
A name originally given to a kind of serpentine, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene and labradorite.
Origin: From 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)