madarosisPronunciation: /ˌmadəˈrəʊsɪs/Definition of madarosis noun [mass noun] Medicine absence or loss of the eyelashes (and sometimes the eyebrows), either as a congenital condition or as a result of an infection. Origin: late 17th century: modern Latin, from Greek, 'baldness', from madaros 'bald'madarosis in other Oxford dictionaries Definition of madarosis in the US English dictionary