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Definition of Onyxis
1. Noun. Toenail having its free tip or edges embedded in the surrounding flesh.
Medical Definition of Onyxis
1. A toenail, one edge of which is overgrown by the nailfold, producing a pyogenic granuloma; due to faulty trimming of the toenails or pressure from a tight shoe. Synonym: ingrowing toenail, onychocryptosis, onyxis, unguis aduncus, unguis incarnatus. (05 Mar 2000)