The Collaborative International Dictionary of English v.0.48:
lactating \lactating\ adj. actively producing milk; -- of female mammals. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
lactating adj 1: producing or secreting milk; "a wet nurse"; "a wet cow"; "lactating cows" [syn: wet, lactating] [ant: dry]