Quick definitions from WordNet (shellac)
▸ noun: a thin varnish made by dissolving lac in ethanol; used to finish wood
▸ noun: lac purified by heating and filtering; usually in thin orange or yellow flakes but sometimes bleached white
▸ verb: cover with shellac ("She wanted to shellac the desk to protect it from water spots")
▸ Also see shellac
▸ noun: a thin varnish made by dissolving lac in ethanol; used to finish wood
▸ noun: lac purified by heating and filtering; usually in thin orange or yellow flakes but sometimes bleached white
▸ verb: cover with shellac ("She wanted to shellac the desk to protect it from water spots")
▸ Also see shellac