Definition of racers:
(n) :
A person who participates in races, especially an athlete.
(n) :
Agent noun of race: one that races or is used for racing.
(n) :
A vehicle (or other device) used for, or designed specifically for, racing.
(n) :
A racehorse.
(n) :
A racing pigeon.
(n) :
(video games, informal) A video game involving racing of any kind.