The Collaborative International Dictionary of English v.0.48:

Lanterloo \Lan"ter*loo`\, n.
   An old name of loo
   (a) .
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Loo \Loo\ (l[=oo]), n. [For older lanterloo, F. lanturelu,
   lanturlu, name of the game; orig., the refrain of a
   vaudeville.]
   (a) An old game played with five, or three, cards dealt to
       each player from a full pack. When five cards are used
       the highest card is the knave of clubs or (if so agreed
       upon) the knave of trumps; -- formerly called
       lanterloo.
   (b) A modification of the game of "all fours" in which the
       players replenish their hands after each round by drawing
       each a card from the pack.
       [1913 Webster]

   Loo table, a round table adapted for a circle of persons
      playing loo.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Loo \Loo\ (l[=oo]), v. t. [imp. & p. p. Looed (l[=oo]d); p.
   pr. & vb. n. Looing.]
   To beat in the game of loo by winning every trick. [Written
   also lu.] --Goldsmith.
   [1913 Webster]

WordNet (r) 3.0 (2006):

loo
    n 1: a toilet in Britain [syn: water closet, closet, W.C.,
         loo]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "loo":
   WC, backhouse, basement, bathroom, can, closet, comfort station,
   convenience, crapper, earth closet, head, john, johnny,
   johnny house, latrine, lavatory, necessary, outhouse, pot, potty,
   powder room, privy, rest room, throne, toilet, toilet room, urinal,
   washroom, water closet