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depth-sounder

noun
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Definition of depth-sounder

: an instrument (such as a bathymeter or fathometer) for measuring mechanically the depth of water beneath a ship

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“Depth-sounder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/depth-sounder. Accessed 24 Oct. 2020.

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