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nautophone

American  
[naw-tuh-fohn, not-uh-] / ˈnɔ təˌfoʊn, ˈnɒt ə- /

noun

Nautical.
  1. an electrically operated horn for giving fog warnings.


Etymology

Origin of nautophone

< Greek nauto-, combining form of naûs ship or naútēs sailor + -phone