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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Tri·on·yx n.  Zool. A genus of fresh-water or river turtles which have the shell imperfectly developed and covered with a soft leathery skin.  They are noted for their agility and rapacity.  Called also soft tortoise, soft-shell tortoise, and mud turtle.
 Note: ☞ The common American species (Trionyx ferox syn. Aspidonectus ferox) becomes over a foot in length and is very voracious.  Similar species are found in Asia and Africa.
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From: WordNet (r) 2.0

 Trionyx
      n : type genus of the Trionychidae [syn: genus Trionyx]