PLASTER  , a mixture of

lime, hair and sand, used to cover rough walling of lathwork between timbers (see PLASTER-WORK) ; also a fine white plaster of gypsum, generally known as " plaster of Paris." The word (also as " plaister ") is used in medicine of adhesive mixtures employed externally for the protection of injured surfaces, for support of weak muscular or other structures:or as counter-irritants, soothing applications &c . The ultimate derivation of the word is the Gr . I.isrhao-r pots or €µ'Aavrov in the medical sense, from on, and rAavQety, to daub or smear .