n. A close, water-tight vessel formed like a barrel with staves, headings, and hoops, and used for containing liquids or substances which may become liquid: a generic term comprehending the pipe, hogshead, butt, barrel, etc.n. An irregular measure of capacity.n. In dyeing, an apparatus for steaming and thus fixing the colors of cloths which are printed with a mixture of dyestuffs and mordants.n. A helmet. [In this sense now usually spelled casque (which see).]To put into a cask.To provide with or put on a casque or helmet.n. A casket; a case or shell.