Noun
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
Source: WordNetsonar is an acronym for sound navigation ranging Source: Internet
asdic is an acronym for antisubmarine detection investigation committee Source: Internet
Anti-submarine sensors included sonar (or ASDIC), although training in their use was indifferent. Source: Internet
Hedgehog allowed the target to be attacked while within the usable range of the ASDIC equipment. Source: Internet
Hedgehog solved one of the most pressing problems, keeping ASDIC contact at short ranges. Source: Internet
ASDIC was effective only at low speeds. Source: Internet