adscititious
Derived or acquired from something extrinsic; not part of the real, inherent, or essential nature of a thing.
When the poor man’s integuments, no longer nourished from within, become dead skin, mere adscititious leather and callosity, wearing thicker and thicker, uglier and uglier;[…]— yes then, you may say, his usefulness once more is quite obstructed;[…]it is time that he take to bed, and prepare for departure, which cannot now be distant!
Where it comes from
From Latin adscitus, from past participle of adscisco (“admit”).
Adapted from the Wiktionary entry adscititious (CC BY-SA 4.0).