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Any of various aquatic predatory insects of the family Nepidae, having a long breathing tube projecting from the end of the abdomen.
(Animals) any of various long-legged aquatic insects of the heteropterous family Nepidae, which breathe by means of a long spinelike tube that projects from the rear of the body and penetrates the surface of the water
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|Noun||1.||water scorpion - long-legged aquatic insect having the front legs fitted for seizing and holding prey and the abdomen extended by a long breathing tube|
water bug - a true bug: large aquatic bug adapted to living in or on the surface of water