The Collaborative International Dictionary of English v.0.48:
fat-free \fat-free\ adj. containing no fat; -- of foods. Opposite of fat-containing. Syn: fatless, nonfat. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
fat-free adj 1: without fat or fat solids; "nonfat or fat-free milk" [syn: nonfat, fat-free, fatless] [ant: fat, fatty]