a game where players on two teams attempt to hit each other with balls; dodgeball.
2 n. — Sports
the original name for wheelchair rugby (see Image 1).
Type: 1. Origin — Murderball was developed in Winnipeg by a group of five Canadian wheelchair athletes who sought to create a game for quadriplegic athletes who had reduced arm and hand function. The game was renamed 'wheelchair rugby' (see the 2005 quotation) and was recognized at the 2000 Sydney Paralympic Games as a full medal sport. Teams are co-ed and each player is assessed and assigned a sport classification based on their ability level, and teams must have a mix of classification values on the court so players compete with teammates with different functional abilities. In teams of four, players aim to carry the ball across the opposing team's goal line (see the second 1981 quotation).
There is an international foundation (established in 1993) that governs the sport in three zones across the world: the Americas Zone, the Asia-Oceania Zone, and the European Zone. The game's popularity increased after a documentary titled Murderball was released in 2005. In the US, the sport is known as "quad rugby". See also the International Wheelchair Rugby Federation (IWRF) resource.
OED-3 marks this meaning as "orig. Canad.".
Images:

Image 1: A murderball game between Canada and the US. Source: Wikimedia Commons.