also ae·ti·ol·o·gy (ē′tē-ŏl′ə-jē)
n. pl. e·ti·ol·o·gies also ae·ti·ol·o·gies1.
a. The study of causes or origins. b. The branch of medicine that deals with the causes or origins of disease.
2. a. Assignment of a cause, an origin, or a reason for something. b. The cause or origin of a disease or
disorder as determined by medical diagnosis.