foghorn

English Thesaurus

1. a warning device consisting of a horn that generates a loud low tone (noun.artifact)

hypernym	:	horn,
definition	:	an alarm device that makes a loud warning sound (noun.artifact)

hypernym	:	signaling device,
definition	:	a device used to send signals (noun.artifact)

hyponym	:	diaphone,
definition	:	a foghorn that makes a signal consisting of two tones (noun.artifact)

2. a loud low warning signal that can be heard by fogbound ships (noun.communication)

hypernym	:	alarm, alarum, alert, warning signal,
definition	:	an automatic signal (usually a sound) warning of danger (noun.communication)