water beetle
US /ˈwɑː.t̬ɚ ˌbiː.tl̩/
UK /ˈwɑː.t̬ɚ ˌbiː.tl̩/

1.
besouro aquático
any of various beetles that live in or on water, typically having a smooth, oval body and legs adapted for swimming
:
•
The pond was teeming with tiny water beetles.
O lago estava cheio de pequenos besouros aquáticos.
•
A water beetle skittered across the surface of the lake.
Um besouro aquático deslizou pela superfície do lago.