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waterdog

or wa·ter dog

[waw-ter-dawg, -dog, wot-er-]
noun
  1. any of several large salamanders, as a mudpuppy or hellbender.
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Origin of waterdog

First recorded in 1855–60; water + dog
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018