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sonic depth finder

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sonic depth finder

–noun
a sonar instrument that uses echolocation to measure depths under water.
Also called echo sounder.
Compare Fathometer.


Origin:
1925–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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sonic depth finder

noun
depth finder for determining depth of water or a submerged object by means of ultrasound waves 
WordNet® 3.0, © 2006 by Princeton University.
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