Monarch Disease Ontology term MONDO_0007420 (autosomal dominant deafness - onychodystrophy syndrome) can be described as follows. Dominant deafness-onychodystrophy (DDOD) syndrome is a multiple congenital anomalies syndrome characterized by congenital hearing impairment, small or absent nails on the hands and feet, and small terminal phalanges. Also known as: DDOD syndrome, autosomal dominant deafness-onychodystrophy syndrome, deafness-onychodystrophy syndrome, autosomal dominant.