1. A device on an automobile for making a warning noise
   "He honked the automobile horn to alert the pedestrian";
   - car horn, motor horn, horn, hooter

Derived forms: automobile horns

Type of: alarm, alarm system, warning device

Part of: auto [informal], autocar [archaic], automobile [N. Amer], car, motor [Brit, informal], motorcar, wheel [informal], whip [US, informal]