water-bug

water bug

noun
1.
any of various aquatic bugs, as of the family Belostomatidae (giant water bug)
2.
(loosely) a large cockroach, especially the American cockroach.

Origin:
1740–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
water bug
 
n
any of various heteropterous insects adapted to living in the water or on its surface, esp any of the family Belostomatidae (giant water bugs), of North America, India, and southern Africa, which have flattened hairy legs

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