MedGen

Yellow nail syndrome (YNS) is classically considered to comprise a clinical triad of yellow nails, lymphedema, and respiratory tract involvement. Two of these symptoms are required for the diagnosis, since the complete triad is only observed in about one-third of patients. Onset is usually after puberty (Hoque et al., 2007). [from OMIM]

Odontomicronychial dysplasia is a rare, hereditary ectodermal dysplasia syndrome characterized by involvement of teeth and nails - precocious eruption and shedding of deciduous dentition, precocious eruption of secondary dentition with short, rhomboid roots, and short, thin, slow growing nails. [from ORDO]

Nails whose growth is slower than normal. [from HPO]