Leatherback

from WordNet (r) 3.0 (2006)

leatherback
    n 1: wide-ranging marine turtle with flexible leathery carapace;
         largest living turtle [syn: {leatherback turtle},
         {leatherback}, {leathery turtle}, {Dermochelys coriacea}]

from The Collaborative International Dictionary of English v.0.48

Leatherback \Leath"er*back`\, n. (Zool.)
   A large sea turtle ({Sphargis coriacea}), having no bony
   shell on its back. It is common in the warm and temperate
   parts of the Atlantic, and sometimes weighs over a thousand
   pounds; -- called also {leather turtle}, {leathery turtle},
   {leather-backed tortoise}, etc.
   [1913 Webster] Leatheret