Noun foghorn has 2 senses
  1. foghorn, fogsignal - a loud low warning signal that can be heard by fog-bound ships
    --1 is a kind of alarm, alert, warning signal, alarum
  2. foghorn - a warning device consisting of a horn that generates a loud low tone
    --2 is a kind of
    horn; signaling device
    --2 has particulars: diaphone
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