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A device used underwater to produce pulses of sound, as for an echo sounder or a locator device.
a device that makes a pinging sound, esp one that can be preset to ring at a particular time
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|Noun||1.||pinger - a pulse generator used for echo sounding in sonar|
pulse generator - a generator of single or multiple voltage pulses; usually adjustable for pulse rate
asdic, echo sounder, sonar - 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 antisubmarine detection investigation committee"