Definitions for echo sounder
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Princeton's WordNet
sonar, echo sounder, asdic(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
"sonar is an acronym for sound navigation ranging"; "asdic is an acronym for antisubmarine detection investigation committee"
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"echo sounder." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/echo sounder>.