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From The Collaborative International Dictionary of English v.0.48:
Jet \Jet\, n. [F. jet, OF. get, giet, L. jactus a throwing, a throw, fr. jacere to throw. Cf. Abject, Ejaculate, Gist, Jess, Jut.] [1913 Webster] 1. A shooting forth; a spouting; a spurt; a sudden rush or gush, as of water from a pipe, or of flame from an orifice; also, that which issues in a jet. [1913 Webster] 2. Drift; scope; range, as of an argument. [Obs.] [1913 Webster] 3. The sprue of a type, which is broken from it when the type is cold. --Knight. [1913 Webster] Jet propeller (Naut.), a device for propelling vessels by means of a forcible jet of water ejected from the vessel, as by a centrifugal pump. Jet pump, a device in which a small jet of steam, air, water, or other fluid, in rapid motion, lifts or otherwise moves, by its impulse, a larger quantity of the fluid with which it mingles. [1913 Webster]