The Collaborative International Dictionary of English v.0.48:

Lactate \Lac"tate\, n. [L. lac, lactis, milk: cf. F. lactate.]
   (Chem.)
   A salt of lactic acid.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lactate
    n 1: a salt or ester of lactic acid
    v 1: give suck to; "The wetnurse suckled the infant"; "You
         cannot nurse your baby in public in some places" [syn:
         breastfeed, suckle, suck, nurse, wet-nurse,
         lactate, give suck] [ant: bottlefeed]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "lactate":
   aliment, breast-feed, dry-nurse, excrete, fatten, fatten up,
   force-feed, foster, give out, nourish, nurse, nurture, nutrify,
   produce, secern, secrete, stuff, suckle, tear, water, weep,
   wet-nurse