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 ]
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