As she looked full at me, I saw her face grow sharper and paler, and the marks of the old wound lengthen out until it cut through the disfigured lip, and deep into the nether lip, and slanted down the face.
Her eyes wandered restlessly over the distant prospect, and she bit her nether lip to stop that busy mouth.
There are no more uses of "nether" in the book.
Show samples from other sources
Intently he listened for any sound from the nether world...
James Matthew Barrie -- The Adventures of Peter Pan
...she could not bear a coarse word, so far as her limited vocabulary reached she had a passion for euphemisms, and she scented indecency everywhere; she never spoke of trousers but referred to them as nether garments...