JET n.
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, lif…
KEEP n.
iege; the donjon. See Illust. of Castle. The prison strong, Within whose keep the captive knights were laid. Dryden. The lower chambers of those gloomy keeps. Hallam. I think . . . the keep, or principal part of a castle, was so called because the lord and his domestic circle kept, abode, or lived there. M. A. Lower.…