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Definition of Water beetle
1. Noun. Any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimming.
Definition of Water beetle
1. 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. ¹
¹ Source: wiktionary.com
Medical Definition of Water beetle
1.