1. [n]  an artificially produced flow of water
2. [n]  an airplane powered by one or more jet engines
3. [n]  the occurrence of a sudden discharge (as of liquid)
4. [n]  a hard black form of lignite that takes a brilliant polish and is used in jewellery or ornamentation
5. [adj]  of the blackest black; similar to the color of jet or coal
6. [v]  issue in a jet; come out in a jet; stream or spring forth; "Water jetted forth"; "flames were jetting out of the building"
7. [v]  fly a jet plane

JET is a 3 letter word that starts with J.

1. \Jet\, n.
   Same as 2d {Get}. [Obs.] --Chaucer.
   
   

2. \Jet\, n. [OF. jet, jayet, F. ja["i]et, jais, L. gagates,
   fr. Gr. ?; -- so called from ? or ?, a town and river in
   Lycia.] [written also {jeat}, {jayet}.] (Min.)
   A variety of lignite, of a very compact texture and velvet
   black color, susceptible of a good polish, and often wrought
   into mourning jewelry, toys, buttons, etc. Formerly called
   also {black amber}.
   
   {Jet ant} (Zo["o]l.), a blackish European ant ({Formica
      fuliginosa}), which builds its nest of a paperlike
      material in the trunks of trees.
   
   

3. \Jet\, n. [F. jet, OF. get, giet, L. jactus a throwing, a
   throw, fr. jacere to throw. Cf. {Abject}, {Ejaculate},
   {Gist}, {Jess}, {Jut}.]
   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. --Knight.
   
   {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.
   
   

4. \Jet\, v. i. [imp. & p. p. {Jetted}; p. pr. & vb. n.
   {Jetting}.] [F. jeter, L. jactare, freq. fr. jacere to throw.
   See 3d {Jet}, and cf. {Jut}.]
   1. To strut; to walk with a lofty or haughty gait; to be
      insolent; to obtrude. [Obs.]
   
            he jets under his advanced plumes!    --Shak.
   
            To jet upon a prince's right.         --Shak.
   
   2. To jerk; to jolt; to be shaken. [Obs.] --Wiseman.
   
   3. To shoot forward or out; to project; to jut out.
   
   

5. \Jet\, v. t.
   To spout; to emit in a stream or jet.
   
         A dozen angry models jetted steam.       --Tennyson.