The Collaborative International Dictionary of English v.0.48:
Mummer \Mumm"er\, n. [Cf. OF. mommeur. See Mumm, and cf. Momier.] One who mumms, or makes diversion in disguise; a masker; a buffon. [1913 Webster] Jugglers and dancers, antics, mummers. --Milton. [1913 Webster]WordNet (r) 3.0 (2006):
mummer n 1: an actor who communicates entirely by gesture and facial expression [syn: mime, mimer, mummer, pantomimer, pantomimist]