(jet) noun
1. A rich black variety of lignite, used for ornaments.
2. The color of jet; a deep, glossy black.
3. Obs. Black marble.
—adjective Made of or having the appearance of jet. [<OF jaiet <L gagates <Gk. gagatēs, from Gagai, a Lycian town where it was mined]
—jet′–black′ (-blak′) adjective & noun

(jet) noun
1. That which spurts out from a narrow orifice; a gushing flow.
2. A spout or nozzle.
3. A projecting or overhanging course of bricks or the like; jut.
3. A jet plane. [<v.]
—v.t. & v.i. jet·ted, jet·ting To spurt forth or emit in a stream; spout. [<F jeter throw, ult. <L jactare, freq. of jacere throw]
Jet. meaning operating by, of, or relating to jet propulsion, may appear as a combining form in hyphemes or solidemes or as the first element in two–word phrases; as in: