A disorder, probably of autoimmune origin, typically resulting in loss of hair in patches from the scalp.
Origin
Mid 19th century; earliest use found in John Forbes (1787–1861), physician and medical journalist. From scientific Latin alopecia areata from classical Latin alōpecia + scientific Latin areata (from classical Latin ārea a bald patch (Celsus); in post-classical Latin also a type of baldness + -āta).