Noun water rat has 3 senses
  1. water dog, water rat - a person who enjoys being in or on the water
    --1 is a kind of sailor, crewman
  2. water vole, water rat, Arvicola amphibius - common large Eurasian vole
    --2 is a kind of vole, field mouse
    --2 is a member of Arvicola, genus Arvicola
  3. water rat - any of various amphibious rats
    --3 is a kind of
    rodent, gnawer, gnawing animal
    --3 has particulars: beaver rat
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