Source : Webster's Revised Unabridged Dictionary (1913)

Missy \Mis"sy\, n. (Min.)
   See {Misy}.

Missy \Mis"sy\, n.
   An affectionate, or contemptuous, form of miss; a young girl;
   a miss. -- a. Like a miss, or girl.

Source : WordNet®

missy
     n : a young woman; "a young lady of 18" [syn: {girl}, {miss}, {young
         lady}, {young woman}, {fille}]