foghorn

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foghorn

a mechanical instrument sounded at intervals to serve as a warning to vessels in fog

Foghorn

 

an electroacoustic device of the diaphragm type installed in lighthouses and shore beacons; used to produce a shrill, high-pitched signal that can be heard on board a ship during periods of fog or reduced visibility. The signal of a foghorn is audible at distances up to 15 nautical miles.

foghorn

[′fäg‚hȯrn]
(navigation)
A horn used as a fog signal.