Definitions for water beetle
Random House Webster's College Dictionary
any of various aquatic beetles, as a predaceous diving beetle of the family Dytiscidae.
Origin of water beetle:
any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimming
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.
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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