sonic depth finder

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


Origin:
1925–30

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World English Dictionary
sonic depth finder
 
n
See also sonar an instrument for detecting the depth of water or of a submerged object by means of sound waves; Fathometer

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Also called a sonic depth finder economic: adjective: having to do with money.
Also called a sonic depth finder plain: noun: flat, smooth area at a low elevation.
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