From The Collaborative International Dictionary of English v.0.48 :
losses \losses\ n.
something lost, especially money lost at gambling. Inverse of
winnings.
Syn: losings.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
losses
n 1: something lost (especially money lost at gambling) [syn:
losings, losses] [ant: profits, win, winnings]