Source : Webster's Revised Unabridged Dictionary (1913)

Putt \Putt\, n. [Cf. {Put}, v. t.] (Golf)
   A stroke made on the putting green to play the ball into a
   hole.

Putt \Putt\, v. i. (Golf)
   To make a putt.

Source : WordNet®

putt
     n : hitting a golf ball on the putting surface with a putter;
         "his putting let him down today" [syn: {putting}]

putt
     v 1: strike (a golf ball) lightly, with a putter; "he putted the
          ball several feet past the hole"
     2: : hit a putt; "he lost because he putted so poorly"