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backswimmer

[bak-swim-er] /ˈbækˌswɪm ər/
noun
1.
any of numerous predaceous aquatic hemipterous insects, of the family Notonectidae, that swim on their backs, and may inflict a painful bite if handled.
Also called boat bug.
Origin
1860-1865
1860-65; back1 + swimmer
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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