WordReference Random House Unabridged Dictionary of American English © 2026
wa′ter bee′tle, 
  1. Insectsany of various aquatic beetles, as a predaceous diving beetle.
  • 1660–70

Collins Concise English Dictionary © HarperCollins Publishers::
water beetle n
  1. any of various beetles of the families Dysticidae, Hydrophilidae, etc, that live most of the time in freshwater ponds, rivers, etc

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