has part has part characteristic of inheres in has modifier Thin nail Abnormal toenail morphology Thin toenail 2014-03-23T05:34:43Z HP:0012746 Thin toenails No objective standard for nail thickness could be identified. An unsupported claim suggests that nails are 0.5 mm in females and 0.6 mm in males (http://www.emedicine.com/orthoped/topic421.htm). Thin nails are usually brittle, may easily fray, or break at the free edge. Thin nails usually grow slowly but this definition does not require slow growth of the nail. Note that the term koilonychia is an abnormal shape of the fingernail where the nail has raised ridges and is thin and concave. Since it include other characteristics besides thin nails, it should not be used to indicate this. The affected digits should be specified. Toenail that appears thin when viewed on end. HP:0040038 UMLS:C3554113 Thin toenail abnormal decreased thickness nail of pedal digit