waterdog

or wa·ter dog

[ waw-ter-dawg, -dog, wot-er- ]

noun

1. any of several large salamanders, as a mudpuppy or hellbender.

Word History and Origins

Origin of waterdog¹

First recorded in 1855–60; water + dog

Example Sentences

Because the waterdog never grows up, it must spend its entire life in water.

From Science News For Students