What does "rounders" mean?

A team sport played with bat and ball with one fielding side and one batting side. It is similar to softball and baseball.

What is a synonym for "rounders"?

Common synonyms include: bat-and-ball game, bingo, checkers, chess, game, sport.

Pronounced //ˈɹaʊ̯nd.ə(ɹ)z//.

/ˈɹaʊ̯nd.ə(ɹ)z/ noun

noun ·Rare ·Advanced level

Noun

1
A team sport played with bat and ball with one fielding side and one batting side. It is similar to softball and baseball. Ireland, UK, uncountable
2
plural of rounder form-of, plural
3
an English ball game similar to baseball wordnet

From round + -er + -s, presumably for the circuit that batters make around the field.