water rat

noun

1
: a rodent that frequents water
2
: a waterfront loafer or petty thief

Examples of water rat in a Sentence

Recent Examples on the Web
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Scientists suspect the creatures’ diets changed because of the arrival of a new competitor, the Australian water rat, or rakali, reports the Sydney Morning Herald’s Angus Dalton. Sarah Kuta, Smithsonian Magazine, 13 June 2024 The researchers think competition for food caused the disappearance of teeth in the platypus—the spread of the Australo-New Guinean water rat may have affected which prey platypuses hunted for. Elizabeth Rayne, Ars Technica, 7 June 2024

Word History

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of water rat was in the 15th century

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Cite this Entry

“Water rat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20rat. Accessed 3 Jul. 2026.

Kids Definition

water rat

noun
: a rodent that is found in or near water

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