1. a game played by two or four players in an enclosed court using racquets to hit a small rubber ball against the walls
2. the small rubber ball used in the game of racquetball

Examples

• We play racquetball every Tuesday at the gym.
• The racquetball court was booked for the entire afternoon.
• She bought a new racquet for her racquetball games.
• The racquetball bounced off the back wall at high speed.
• Racquetball is a great cardiovascular workout.
• He lost the racquetball under the bench.
• The racquetball tournament starts next week.