Jet, n.
 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.
 2.  Drift; scope; range, as of an argument. [Obs.]
 3.  The sprue of a type, which is broken from it when the type is cold.
 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.