IPA: /ˌsɪmp.təˈmæt.ə.lə.dʒi/
KK: /sɪmptəˈmætələdʒi/
The study or analysis of the symptoms associated with a disease.
The doctor explained the symptomatology of the illness to the patient.
Symptomatology → It is formed from "symptom" (from Greek "symptōma", meaning a sign or indication) and "-ology" (from Greek "logia", meaning the study of). The word refers to the study of symptoms or signs of diseases.
Think of 'symptom' as a sign of something wrong and '-ology' as the study of that sign — that's why symptomatology means the study of symptoms.