mum·mer \ˈməmə(r)\noun (-s) Etymology: Middle French mommeur, momeur masker, from Old French momeor, from momer to go masked + -eor -or 1. a.: an actor in a pantomime b.: a theatrical performer 2.: one who goes merrymaking in disguise especially during festivals < the first of May morning when mummers were dancing in the fields — Winifred Bryher >