Definitions for water beetle
Random House Webster's College Dictionary
wa′ter bee`tle(n.)
any of various aquatic beetles, as a predaceous diving beetle of the family Dytiscidae.
Category: Entomology
Origin of water beetle:
1660–70
Princeton's WordNet
water beetle(noun)
any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimming
Wiktionary
water beetle(Noun)
Any of various freshwater aquatic beetles that have a smooth oval body and flattened hind legs adapted for swimming, and that carry an air bubble underneath their abdomens.
Webster Dictionary
Water beetle(u)
any one of numerous species of aquatic beetles belonging to Dytiscus and allied genera of the family Dytiscidae, and to various genera of the family Hydrophilidae. These beetles swim with great agility, the fringed hind legs acting together like oars
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