ADULT (Acro-dermo-ungual-lacrimal-tooth) syndrome is a rare ectodermal dysplasia syndrome characterized by ectrodactyly, syndactyly, mammary hypoplasia, and excessive freckling as well as other typical ectodermal defects such as hypodontia, lacrimal duct anomalies, hypotrichosis, and onychodysplasia. The disease is ADULT syndrome (MONDO_0007072, a Monarch Disease Ontology id). Also known as: acro-dermato-ungual-lacrimal-tooth syndrome, acrodermatounguallacrimaltooth syndrome, pigment anomaly-ectrodactyly-hypodontia syndrome.