Found 2 items, similar to water beetle.
English → English (WordNet) Definition: water beetle water beetle n : any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimming
English → English (gcide) Definition: Water beetle Water beetle \Wa“ter bee”tle\ (Zo["o]l.) Any one of numerous species of aquatic beetles belonging to Dytiscus and allied genera of the family Dytiscid[ae], and to various genera of the family Hydrophilid[ae]. These beetles swim with great agility, the fringed hind legs acting together like oars. [1913 Webster]