1. Small spherical pellets filled with water-soluble dye, used as ammunition in the sport of paintball
Usage: Usually used in plural form; Common in recreational sports and military simulation games
2. The sport or game in which players shoot paintballs at each other using air-powered guns
Usage: Often used as a mass noun or in plural when referring to multiple games or events

Examples

• He loaded paintballs into his marker before the game started.
• The paintballs burst on impact, leaving bright colored marks on the players' gear.
• We spent the afternoon playing paintballs in the outdoor arena.
• Different brands of paintballs vary in quality and accuracy.
• The referee checked that all paintballs met the official size and weight standards.
• She wiped paintballs off her protective goggles after the match.