1. A fast car that competes in races; SYN. race car, racing car.
2. A person or other animal that races.
3. Slender fast-moving North American snakes.

ETYM From Run.
1. Someone who travels on foot by running.
2. A trained athlete who competes in foot races.
3. The rails or glides on which something can move along, usually over snow or ice.
4. A person who is employed to deliver messages or documents.