The Collaborative International Dictionary
leather turtle
Leatherback \Leath"er*back`\, n. (Zo["o]l.) 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.