Source : Webster's Revised Unabridged Dictionary (1913)

Charmer \Charm"er\, n.
   1. One who charms, or has power to charm; one who uses the
      power of enchantment; a magician. --Deut. xviii. 11.

   2. One who delights and attracts the affections.

Source : WordNet®

charmer
     n 1: someone with an assured and ingratiating manner [syn: {smoothie},
           {smoothy}, {sweet talker}]
     2: a person who charms others (usually by personal
        attractiveness) [syn: {beguiler}]