leatherback

This term is a specific biological designation used primarily in zoological and marine contexts. It describes a unique anatomical feature where the shell is composed of tough, rubbery skin rather than the hard, scute-covered carapace found in most other sea turtles.

In common usage, the word is almost always used to refer to the species Dermochelys coriacea. While it functions as a countable noun, it is frequently used in a collective or generic sense when discussing conservation efforts or marine biology.