1. A pneumatic horn
   "The ship's air horn sounded loudly as it left the harbour"
    
2. Air intake of a carburettor
   "The mechanic cleaned the air horn to improve the engine's performance"

Derived forms: air horns

Type of: horn, inlet, intake

Part of: carburetor [N. Amer], carburetter [rare], carburettor [Brit]

Encyclopedia: Air horn