[ noun ] the branch of medical science dealing with the classification of disease <noun.cognition>
Nosology \No*sol"o*gy\, n. [Gr. no`sos disease + -logy: cf. F. nosologie.] 1. A systematic arrangement, or classification, of diseases.
2. That branch of medical science which treats of diseases, or of the classification of diseases.
pathology \pa*thol"o*gy\ (-j[y^]), n.; pl. {pathologies} (-j[i^]z). [Gr. pa`qos a suffering, disease + -logy: cf. F. pathologie.] 1. (Med.) The science which treats of diseases, their nature, causes, progress, symptoms, etc.
Note: Pathology is general or special, according as it treats of disease or morbid processes in general, or of particular diseases; it is also subdivided into internal and external, or medical and surgical pathology. Its departments are {nosology}, {[ae]tiology}, {morbid anatomy}, {symptomatology}, and {therapeutics}, which treat respectively of the classification, causation, organic changes, symptoms, and cure of diseases.
2. (Med.) The condition of an organ, tissue, or fluid produced by disease. [Webster 1913 Suppl.]
{Celluar pathology}, a theory that gives prominence to the vital action of cells in the healthy and diseased function of the body. --Virchow.