echo sounder

/ˌɛkoʊ ˈsaʊndər/
IPA guide

Definitions of echo sounder
  1. 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
    synonyms: asdic, sonar
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    type of:
    measuring device, measuring instrument, measuring system
    instrument that shows the extent or amount or quantity or degree of something
    navigational instrument
    an instrument used for navigating
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