Plural of foghorn; loud signals or horns used to warn ships or vehicles about fog conditions.
From 'fog' + 'horn,' a compound word where a horn is used to signal through fog. Used since the 19th century in maritime safety.
Foghorns have one of the most iconic sounds in history—that deep, mournful 'woo-woo' is actually designed at a frequency that travels really far through fog when nothing else can!
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