The Collaborative International Dictionary of English v.0.48:

Kitty \Kit"ty\, n.
   1. A kitten; also, a pet name or calling name for the cat.
      [Webster 1913 Suppl.]

   2. [Etym. uncertain.] (Gaming) The percentage taken out of a
      pool to pay for refreshments, or for the expenses of the
      table; by extension, any pool of money aggregated from
      small contributions. --R. F. Foster.
      [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

kitty
    n 1: the combined stakes of the betters [syn: pool, kitty]
    2: the cumulative amount involved in a game (such as poker)
       [syn: pot, jackpot, kitty]
    3: young domestic cat [syn: kitten, kitty]
    4: informal terms referring to a domestic cat [syn: kitty,
       kitty-cat, puss, pussy, pussycat]