'foghorn' definitions:

Definition of 'foghorn'

From: WordNet
noun
A loud low warning signal that can be heard by fogbound ships [syn: foghorn, fogsignal]
noun
A warning device consisting of a horn that generates a loud low tone

Definition of 'foghorn'

From: GCIDE
  • foghorn \fog"horn\ n. A horn that emits a loud low-pitched sound, used on ships navigating in a fog, to warn other ships of their presence.
  • Syn: fog signal. [PJC]

Synonyms of 'foghorn'

From: Moby Thesaurus