What does Leatherback mean in the Bible?

Dictionary

Webster's Dictionary - Leatherback
(n.) 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.

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Trunkback - ) The Leatherback
Luth - ) The Leatherback
Sea Turtle - (1):...
Any one of several very large species of chelonians having the feet converted into paddles, as the green turtle, hawkbill, loggerhead, and Leatherback