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). [1913 Webster]

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OXFORD DICTIONARY

gabbro, n. (pl. -os) a dark granular plutonic rock of crystalline texture.

Derivative

gabbroic adj. gabbroid adv.

Etymology

It. f. Gabbro in Tuscany

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