1620s, "flat thin tablet used by an artist to lay and mix colors," from French palette, from Old French palete "small shovel, blade" (13c.) diminutive of pale "shovel, blade," from Latin pala "spade, shoulder blade," probably from PIE *pak-slo-, from root *pag- (see pact). Transferred sense of "colors used by a particular artist" is from 1882.
