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2 definitions found
 for soft-shell tortoise
From The Collaborative International Dictionary of English v.0.48 :

  Tortoise \Tor"toise\, n. [OE. tortuce, fr. OF. tortis crooked,
     fr. L. tortus twisted, crooked, contorted, p. p. of torquere,
     tortum, to wind; cf. F. tortue tortoise, LL. tortuca,
     tartuca, Pr. tortesa crookedness, tortis crooked. so called
     in allusion to its crooked feet. See Torture.]
     1. (Zool.) Any one of numerous species of reptiles of the
        order Testudinata.
        [1913 Webster]
  
     Note: The term is applied especially to the land and
           fresh-water species, while the marine species are
           generally called turtles, but the terms tortoise and
           turtle are used synonymously by many writers. See
           Testudinata, Terrapin, and Turtle.
           [1913 Webster]
  
     2. (Rom. Antiq.) Same as Testudo, 2.
        [1913 Webster]
  
     Box tortoise, Land tortoise, etc. See under Box,
        Land, etc.
  
     Painted tortoise. (Zool.) See Painted turtle, under
        Painted.
  
     Soft-shell tortoise. (Zool.) See Trionyx.
  
     Spotted tortoise. (Zool.) A small American fresh-water
        tortoise ({Chelopus guttatus or Nanemys guttatus)
        having a blackish carapace on which are scattered round
        yellow spots.
  
     Tortoise beetle (Zool.), any one of numerous species of
        small tortoise-shaped beetles. Many of them have a
        brilliant metallic luster. The larvae feed upon the leaves
        of various plants, and protect themselves beneath a mass
        of dried excrement held over the back by means of the
        caudal spines. The golden tortoise beetle ({Cassida
        aurichalcea) is found on the morning-glory vine and
        allied plants.
  
     Tortoise plant. (Bot.) See Elephant's foot, under
        Elephant.
  
     Tortoise shell, the substance of the shell or horny plates
        of several species of sea turtles, especially of the
        hawkbill turtle. It is used in inlaying and in the
        manufacture of various ornamental articles.
  
     Tortoise-shell butterfly (Zool.), any one of several
        species of handsomely colored butterflies of the genus
        Aglais, as Aglais Milberti, and Aglais urticae, both
        of which, in the larva state, feed upon nettles.
  
     Tortoise-shell turtle (Zool.), the hawkbill turtle. See
        Hawkbill.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Trionyx \Tri*on"yx\, 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]
  
     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.
           [1913 Webster]

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