Jet

jet, n. a rich black variety of mineral coal, very hard and compact, taking a brilliant polish, used for ornaments.— adj. Jet′-black .— n. Jet′tine .— adj. Jet′ty , made of jet, or black as jet. [O. Fr. jaet —L.—Gr. gag atēs , from Gagas , a town and river in Lycia, in Asia Minor, where it was obtained.]