Backswimmer meaning

băk'swĭm'ər
Any of various predatory hemipteran insects of the family Notonectidae that live in freshwater habitats and swim on their backs by means of oarlike hind legs.
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Any of a family (Notonectidae) of hemipterous water bugs that swim rapidly on their back by use of their long, oarlike legs.
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Any of various aquatic insects, of the family Notonectidae, that swim on their backs.
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Origin of backswimmer