nosology

Etymology

From post-classical Latin nosologia, formed as from Ancient Greek νόσος (nósos, “disease”) + Ancient Greek -λογία (-logía, “discourse, branch of knowledge”).

noun

1. A treatise or written classification of diseases.
2. The study of diseases; the systematic investigation or classification of disease.
3. The characteristics or scientific understanding of a specific disease.
   2003: Thomas Arnold … constructed a nosology of insanity explicitly on the basis of the Lockean philosophy of mind — Roy Porter, Flesh in the Age of Reason (Penguin 2004, p. 312)