Jack"et (?), n. [F. jaquette,
dim. of jaque. See 3d Jack, n.]
1. A short upper garment, extending downward
to the hips; a short coat without skirts.
2. An outer covering for anything, esp. a
covering of some nonconducting material such as wood or felt, used to
prevent radiation of heat, as from a steam boiler, cylinder, pipe,
etc.
3. (Mil.) In ordnance, a strengthening
band surrounding and reënforcing the tube in which the charge is
fired.
4. A garment resembling a waistcoat lined
with cork, to serve as a life preserver; -- called also cork
jacket.
Blue jacket. (Naut.) See under
Blue. -- Steam jacket, a space
filled with steam between an inner and an outer cylinder, or between
a casing and a receptacle, as a kettle. -- To dust one's
jacket, to give one a beating. [Colloq.]
Jack"et, v. t. 1.
To put a jacket on; to furnish, as a boiler, with a
jacket.
2. To thrash; to beat. [Low]
