Definition of ASDIC in English:



  • An early form of sonar used to detect submarines.

    • ‘Intent on getting a definite asdic signal before asking for air support, Jakey steered nearer to the Island.’
    • ‘The asdic operator could also train the oscillator in a horizontal plane and thus the combined system at last made feasible the accurate location of a submerged submarine in terms of both range and bearing from the equipment.’
    • ‘The second Netherlands submarine, K.XI, arrived in Fremantle on March 22, 1945 after spending most of the war as an asdic training submarine for the British and Indian navies.’
    • ‘The creeping attack insured that the first assault would come without warning because the enemy would not pick up the asdic of the first ship right above her.’


World War I: said to be an acronym from Allied Submarine Detection Investigation Committee.