soft-shelled turtle definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of a family (Trionychidae) of aquatic turtles of North America, Asia, and Africa, with a soft, oval, leathery shell; esp., a North American genus (Trionyx) common in the Mississippi drainage
soft-shelled turtle definition by American Heritage Dictionary
Any of various freshwater turtles of the family Trionychidae, having a flat carapace covered with leathery skin and a fleshy elongated snout.