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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Boat bug Zool. An aquatic hemipterous insect of the genus Notonecta; -- so called from swimming on its back, which gives it the appearance of a little boat. Called also boat fly, boat insect, boatman, and water boatman.
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From: WordNet (r) 2.0

 boat bug
      n : carnivorous aquatic bug having paddle-like hind legs [syn: water
           boatman]