Plural of asdic; an early type of sonar system used to detect submarines, developed during World War II.
From the acronym ASDIC: Anti-Submarine Detection Investigation Committee. British military acronym from the 1930s-40s.
ASDIC was a game-changer in naval warfare—before sonar, submarines were nearly invisible hunters, but this technology let navy ships 'hear' underwater sounds and find them!
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