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 etc. The ultimate derivation of the word is the Gr. t/wrXao'Tpoi' or entrXaffTOV in the medical sense, from kv, on, and ir\a.<r<Teiv, to daub or smear.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)