{Flake knife} (Arch[ae]ol.), a cutting instrument used by savage tribes, made of a flake or chip of hard stone. --Tylor. {Flake stand}, the cooling tub or vessel of a still worm. --Knight. {Flake white}. (Paint.) (a) The purest white lead, in the form of flakes or scales. (b) The trisnitrate of bismuth. --Ure.