Noun
A systematic arrangement, or classification, of diseases.
That branch of medical science which treats of diseases, or of the classification of diseases.
Source: Webster's dictionaryNosology (from the Greek 'nosos,' meaning 'disease,' and 'logos,' referring to 'study') is not a sport for the timid, and certainly not for those so scrupulous about rules and order that they demand consistency in all things. Sherwin B. Nuland
A chief difficulty in nosology is that diseases often cannot be defined and classified clearly, especially when etiology or pathogenesis are unknown. Source: Internet
The time component Karl Ludwig Kahlbaum (1828–1899) Psychiatric nosology in the nineteenth-century was chaotic and characterised by a conflicting mosaic of contradictory systems. Source: Internet
Thus, all purely symptomatic categories have disappeared from the nosology". Source: Internet