sclerotized

[ skleer-uh-tahyzd, skler- ]
/ ˈsklɪər əˌtaɪzd, ˈsklɛr- /

adjective

(especially of the cuticle of an arthropod) hardened by the presence of substances other than chitin, as by scleroproteins, waxes, or calcium salts.
Pathology. sclerosed.

Origin of sclerotized

First recorded in 1960–65; sclerot(ic) + -ize + -ed2