| onychotrophy | Nutrition of the nails. Origin: onycho-+ G. Trophe, nourishment (05 Mar 2000) |
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| onyx | <chemical> Chalcedony in parallel layers of different shades of colour. It is used for making cameos, the figure being cut in one layer with the next as a ground. Onyx marble, a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico. Origin: L, fr. Gr. A claw, finger nail, a veined gem. See Nail, and cf. Onycha. Source: Websters Dictionary (01 Mar 1998) |
| onyxis | 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) |
| onyxitis | <medicine> A whitlow. An affection of a finger or toe, attended with ulceration at the base of the nail, and terminating in the destruction of the nail. Origin: NL. See Onyx. Source: Websters Dictionary (01 Mar 1998) |