Definition of: physiology

(fiz′ē·ol′ə·jē) noun
1. The branch of biology that treats of the vital phenomena manifested by animals or plants; the science of organic functions, as distinguished from anatomy and morphology.
2. The aggregate of organic processes: the physiology of the frog. [<F physiologie <L physiologia <Gk., natural philosophy <physiologos a speaker on nature <physis nature + logos a word]
—phys′i·ol′o·gist noun