idiopathy /ˌɪdiˈɒpəθi 
/ ▸ noun (plural idiopathies)
Medicine a disease or condition which arises spontaneously or for which the cause is unknown. – ORIGIN mid 17th century: from French idiopathie or its source modern Latin idiopathia, from Greek idiopatheia, from idios ‘own, private’ + -patheia ‘suffering’.
EnglishOxford Dictionary of English
