A coilgun.

(military) A massive and heavy mobile artillery gun, built, transported by, and fired from a specially designed rail car.

(physics) Any device that produces a stream of electrons, especially a narrow stream that is focused onto a phosphor screen.

A hand-held (or mounted) device that emits a radar beam and uses the Doppler effect to measure the velocity of moving objects (especially traffic)

simple past tense and past participle of jump the gun

An electrically or pneumatically powered gun used to drive nails into a surface.

Third-person singular simple present indicative form of jump the gun

present participle of jump the gun

An expert gunner or gunman. / (by extension) Someone most highly rated.

Alternative spelling of snowgun