Source : Webster's Revised Unabridged Dictionary (1913)

Meow \Me*ow"\, v. i. & n.
   See 6th and 7th {Mew}.

Source : WordNet®

meow
     n : the sound made by a cat (or any sound resembling this) [syn:
          {mew}, {miaou}, {miaow}]
     v : cry like a cat; "the cat meowed" [syn: {mew}]