leatherback turtle

US: (leᵺ′ər bak′)

WordReference Random House Unabridged Dictionary of American English © 2025

leath′er•back tur′tle  (leᵺ′ər bak′), 

1. a sea turtle, Dermochelys coriacea, having the shell embedded in a leathery skin, reaching a length of more than 7 ft. (2.1 m) and a weight of more than 1000 lb. (450 kg): the largest living sea turtle;
   an endangered species. Also called leath′er•back′. 

• leather + back¹ 1875–80