foghorn

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a loud low warning signal that can be heard by fogbound ships
• Syn:
fogsignal
• Hypernyms:
alarm, alert, warning signal, alarum
2. a warning device consisting of a horn that generates a loud low tone
• Hypernyms:
horn, signaling device
• Hyponyms:
diaphone