Type genus of the Trionychidae

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Trionyx \Tri*on"yx\, n. [NL., fr. Gr. ? (see Tri- ) + ? a claw.] (Zo["o]l.) 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 ...

Wikipedia Word definitions in Wikipedia
Trionyx is a genus of softshell turtles belonging to the family Trionychidae . In the past many species in the family were classified in this genus, but today T. triunguis , the African or Nile softshell turtle, is the only extant softshell still classified ...