has part has part characteristic of inheres in has modifier Abnormal nail morphology Onychogryphosis HP:0001805 SNOMEDCT_US:52897009 Dystrophic thickened nails There is a build up of keratin causing the nail plate to lift away from the nail bed. The thickened nail plate is usually very hard. Onychauxis and onychogryposis are dystrophic diseases of the nail in which the nail plate becomes decidedly hypertrophied. The differentiation of the two entities is only one of degree of severity. The spelling onychogryposis is occasionally used but it is not correct. HP:0001819 Onychogryphosis is a disorder of nail plate growth that is clinically characterized by an opaque, yellow-brown thickening of the nail plate with associated gross hyperkeratosis, elongation, and increased curvature. Onychogryposis Thick nail HP:0200088 UMLS:C0263537 Thickened nails abnormal increased thickness nail