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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ne·pa n.  Zool. A genus of aquatic hemipterous insects.  The species feed upon other insects and are noted for their voracity; -- called also scorpion bug and water scorpion.
 

From: WordNet (r) 2.0

 Nepa
      n : type genus of the Nepidae: typical elongate-oval water
          scorpions [syn: genus Nepa]