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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.
(Animals) an aquatic bug belonging to the family Notonectidae that swims on its back using its back legs as oars
any of various predatory aquatic bugs, of the family Notonectidae, that swim on their backs.
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|Noun||1.||backswimmer - predaceous aquatic insect that swims on its back and may inflict painful bites|
hemipteran, hemipteron, hemipterous insect, bug - insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis