| A | B |
|---|
melanonychia,  , 
| darkening of the fingernails or toenails; may be seen as a black band under or within the nail plate, extending from the base to the free edge |
| nail | horny protective plate located at the end of the finger or toe |
| nail bed | portion of the skin on which the nail plate rests |
| nail disorder | condition caused by injury to the nail or some disease or imbalance in the body |
| nail folds | folds of normal skin that surround the nail plate |
| nail grooves | slits or furrows on the sides of the nail on which the nail moves as it grows |
| nail plate or nail body | horny plate resting on and attached to the nail bed |
onychatrophia,  ,
| atrophy or wasting away of the nail |
onychauxis or hypertrophy,  ,
| an overgrowth of the nail, usually in thickness rather than length |
| onychia,
| inflammation of the matrix of the nail with formation of pus and shedding of the nail |
onychocryptosis,  ,
| ingrown nails; nail grows into the sides of the tissue around the nail |
onchryposis or onychogryphosis,  ,
| the thickening and increased curvature of the nail; also called "ram's horn nail"; usually the result of injury to the matrix |
onycholysis,  ,
| the loosening of the nail without shedding, usually beginning at the free edge and continuing to the lunula |
| onychomadesis,
| the separation and falling off of a nail from the nail bed; can occur on fingernails and toenails |
| onychophagy,
| bitten nails; the result of an acquired nervous habit that prompts the individual to chew the nail or the hardened cuticle |
