agnail
Torn skin near a toenail or fingernail.
[…] Corrie bit another atom from off the corner of his nail. He had a troublesome "back-friend" or "agnail," at which he often bit.
A corn or sore on the toe or finger.
obsolete
Where it comes from
From Middle English agnail, from Old English angnægl, from ang- + nægl, from Proto-Germanic *naglaz, from Proto-Indo-European *h₃nogʰ-.
Adapted from the Wiktionary entry agnail (CC BY-SA 4.0).