1. plural of diaphone: powerful fog signals or horns used in lighthouses and ships
Usage: nautical; technical

Examples

• The lighthouse keeper tested the diaphones before the storm arrived.
• Ships in the harbor could hear the deep sound of the diaphones through the thick fog.
• The coast guard maintained several diaphones along the rocky shoreline.
• During heavy fog, the diaphones sounded every thirty seconds as a warning.
• The old diaphones were replaced with modern electronic fog signals.