Water-beetle definition

Any of various aquatic beetles, especially the diving beetles of the family Dytiscidae, having a smooth oval body and flattened and fringed hind legs used for swimming.
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Any of various beetles that live in freshwater ponds and streams, sometimes having one or two pairs of swimming legs fringed and functioning as oars.
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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.
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Other Word Forms

Noun

Singular:
water-beetle
Plural:
water-beetles