Dictionary
3 ENTRIES FOUND:

water bug

noun

: a small insect that lives in or near water

Full Definition of WATER BUG

:  any of various small arthropods and especially insects that frequent damp or wet places: as
a :  german cockroach
b :  water boatman
c :  any of various large aquatic bugs (family Belostomatidae) with the hind legs flattened and used for swimming

First Known Use of WATER BUG

1750

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