Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
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
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of various freshwater turtles of the family Trionychidae, having a flat carapace covered with leathery skin and a fleshy elongated snout.