n.

the ball used in playing the game of racquetball

a game played on a handball court with short-handled rackets

Racquetball as an ocular hazard.
Racquetball. A game with preventable injuries.
The Rating of Players in Racquetball Tournaments
Eye Injuries in Squash and Racquetball Players: An Update.
Oxygen cost and energy expenditure of racquetball.
Epidemiology of tennis, squash, and racquetball injuries
Performance of Eye Protectors for Squash and Racquetball.
Area Pair Makes Racquetball Hall; Pfahler-Lyons Team of Neptune Beach Is First Honored in Doubles
Shoulder impingement in tennis/racquetball players treated with subscapularis myofascial treatments.
Reactor geometry and dry confinement for a nuclear reactor enabling the racquetball effect of neutron conservation dry confinement t...