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

1.
ゲンゴロウ, 水生甲虫
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.
池には小さなゲンゴロウがたくさんいた。
•
A water beetle skittered across the surface of the lake.
ゲンゴロウが湖面をすばやく横切った。