rounders
Concise Oxford English Dictionary © 2008 Oxford University Press:
rounders/ˈraʊndəz/
▶plural noun [treated as sing.] (in the UK) a ball game similar to baseball, in which players run round a circuit of bases after hitting the ball with a cylindrical wooden bat, scoring a rounder if all four bases are reached before the ball is fielded.
'rounders' also found in these Oxford entries:

