humoralism
/ˈhjuːm(ə)rəlɪz(ə)m/ /ˈhjuːm(ə)r(ə)lɪz(ə)m/Now historical
noun
The theory that health, disease, and temperament are determined by the four humours of the body. Also (more generally): the theory that all disease can be ascribed to the state of the body fluids, especially the blood.
Origin
Early 19th century. From humoral + -ism. Compare slightly earlier humorism, and also earlier humoralist.