water beetle
US /ˈwɑː.t̬ɚ ˌbiː.tl̩/
UK /ˈwɑː.t̬ɚ ˌbiː.tl̩/
1.
any of various beetles that live in or on water, typically having a smooth, oval body and legs adapted for swimming
:
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The pond was teeming with tiny water beetles.
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A water beetle skittered across the surface of the lake.