OL'IVIN, OL'IVINE, noun [from olive.] A subspecies of prismatic chrysolite of a brownish green, often inclining to a yellowish or grayish green, usually found in roundish grains in other stones; sometimes in large masses, but not crystallized. It is a constituent of many lavas and frequently occurs in basaltic rocks.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI