Jacket (?), n. [F. jaquette, dim. of jaque. See 3d Jack, n.][1913 Webster]
1. A short upper garment, extending downward to the hips; a short coat without skirts.[1913 Webster]
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.[1913 Webster]
3. (Mil.) In ordnance, a strengthening band surrounding and reënforcing the tube in which the charge is fired.[1913 Webster]
4. A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket.[1913 Webster]
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.][1913 Webster]
Jacket, v. t. 1. To put a jacket on; to furnish, as a boiler, with a jacket.[1913 Webster]
2. To thrash; to beat. [Low][1913 Webster]