Etymology The verb is first attested in 1611, the adjective in 1872; borrowed from Latin dēcorticātus, perfect passive participle of dēcorticō (see -ate (verb-forming suffix) and -ate (adjective-forming suffix)), from dē- (“of, from”) + cortex (“bark”, oblique stem in cortic-) + -ō.
1
Ergative To peel or remove the bark, husk, or outer layer from something.
[…] but its striking white trunk, which changes to a bright pink in late spring or summer just before it decorticates, makes it a handsome species.1962, Lindsay Dixon Pryor, Trees in Canberra, page 89:
2
To surgically remove the surface layer, membrane, or fibrous cover of an organ etc.
Etymology The verb is first attested in 1611, the adjective in 1872; borrowed from Latin dēcorticātus, perfect passive participle of dēcorticō (see -ate (verb-forming suffix) and -ate (adjective-forming suffix)), from dē- (“of, from”) + cortex (“bark”, oblique stem in cortic-) + -ō.