The Collaborative International Dictionary of English v.0.48:

Latrine \La*trine"\ (l[.a]*tr[=e]n"), n. [L. latrina: cf. F.
   latrines.]
   A privy, or water-closet, esp. in a camp, hospital, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

latrine
    n 1: a public toilet in a military area

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "latrine":
   WC, backhouse, basement, bathroom, bedpan, can, chamber,
   chamber pot, chemical closet, chemical toilet, closet,
   comfort station, commode, convenience, crapper, earth closet, head,
   jerry, john, johnny, johnny house, jordan, lavatory, loo,
   necessary, outhouse, piss pot, potty, potty-chair, powder room,
   privy, rest room, stool, throne, thunder mug, toilet, toilet room,
   urinal, washroom, water closet