noun Date: circa 1889 any of various predatory aquatic beetles (family Dytiscidae) that breathe while submerged using air trapped under their elytra
DIVING BEETLE
Meaning of DIVING BEETLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012