Source : Webster's Revised Unabridged Dictionary (1913)

Ablactate \Ab*lac"tate\, v. t. [L. ablactatus, p. p. of
   ablactare; ab + lactare to suckle, fr. lac milk.]
   To wean. [R.] --Bailey.

Source : WordNet®

ablactate
     v : gradually deprive (infants) of mother's milk; "she weaned
         her baby when he was 3 months old and started him on
         powdered milk" [syn: {wean}]