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sonar
 
Noun sonar has 1 sense
  1. sonar, echo sounder, asdic - 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; sonar is an acronym for sound navigation ranging; asdic is an acronym for anti-submarine detection investigation committee
    --1 is a kind of measuring instrument, measuring system, measuring device; navigational instrument
    --1 is a part of submarine, pigboat, sub, U-boat
    --1 has parts: pinger; pulse generator
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