The Collaborative International Dictionary of English v.0.48:

Bowls \Bowls\ (b[=o]lz), n. pl.
   See Bowl, a ball, a game.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bowls
    n 1: a bowling game played on a level lawn with biased wooden
         balls that are rolled at a jack [syn: lawn bowling,
         bowls]