GNU Collaborative International Dictionary of English

Found one definition

      
‖Trionyx (?), n. [NL., fr. Gr.  (see Tri-) +  a claw.] (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.

[1913 Webster]

☞ 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.

[1913 Webster]

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