Noun: motor horn
- A device on an automobile for making a warning noise
"He honked the motor horn to alert the pedestrian";
- automobile horn, car horn, horn, hooter
Derived forms: motor 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]