Geol. [a. Fr. euphotide, f. Gr. εὐ- (see EU-) + φῶς, φωτ-ός light.] ‘A crystalline rock consisting essentially of Labrador felspar and diallage, with subordinate intermixtures of hornblende and augite’ (Page). Called also GABBRO, q.v. Also attrib.
1836. Macgillivray, trans. Humboldt’s Trav., xxi. 301. The secondary formations … are pierced by syenitic and euphotide rocks.
1865. Lyell, Elem. Geol., 750.
1879. Spectator, 21 June, 785. Blocks of diorite, of serpentine, and of euphotide.
