Source : Webster's Revised Unabridged Dictionary (1913)

Masker \Mask"er\, n.
   One who wears a mask; one who appears in disguise at a
   masquerade.

Masker \Mask"er\, v. t.
   To confuse; to stupefy. [Obs.] --Holland.

Source : WordNet®

masker
     n : a participant in a masquerade [syn: {masquerader}, {masquer}]