[phys.i.ol.o.gy] n [L physiologia natural science, fr. Gk, fr. physi- + -logia -logy] (1597) 1: a branch of biology that deals with the functions and activities of life or of living matter (as organs, tissues, or cells) and of the physical and chemical phenomena involved--compare anatomy
2: the organic processes and phenomena of an organism or any of its parts or of a particular bodily process -- phys.i.ol.o.gist n