physi(o)-

Nature; physiology.

Greek phusis, nature.

Physiography is another name for physical geography; physiognomy (Greek gnōmōn, a judge, interpreter), is a person's facial features or expression, especially when regarded as indicative of character or ethnic origin; the adjective physiochemical relates to physiological chemistry. Physician and physics derive from the same source by different routes.

Physiology is the branch of biology that deals with the normal functions of living organisms and their parts; some words containing physio‑ relate to that sense: physiotherapy is the treatment of disease, injury, or deformity by physical methods; physiopathology is the study of changes to the body resulting from injury or disease.