Soft-shell Soft-shelled a. Having a soft or fragile shell.
  Soft-shell clam Zool., the long clam. See Mya.
  Soft-shelled crab. Zool. See the Note under Crab, 1.
  Soft-shelled turtle. Zool. Same as Soft tortoise, under Soft.
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  soft-shelled turtle
       n : voracious aquatic turtle with a flat flexible shell covered
           by a leathery skin; can inflict painful bites [syn: pancake
           turtle]