rounder

(rounˈdər)

1. One that rounds, especially a tool for rounding corners and edges.
2. One, such as a security guard, who makes rounds.
3. A dissolute person.
4. Sports
   a. A boxing match that goes on for a specified number of rounds. Often used in combination: a five-rounder.
   b. rounders (used with a sing. verb) An English ball game similar to baseball.