WordReference Random House Unabridged Dictionary of American English © 2025
wa′ter bug′, 
    1. Insectsany of various aquatic bugs, as of the family Belostomatidae (giant water bug.)
    2. Insects(loosely) a large cockroach, esp. the American cockroach.
    • 1740–50

Collins Concise English Dictionary © HarperCollins Publishers::
water bug
  1. 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
'water bug' also found in these entries (note: many are not synonyms or translations):
giant water bug

Forum discussions with the word(s) "water bug" in the title:


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