also: よんたいえき
noun
four humors; cardinal humors
Historical term from ancient and medieval medicine, referring to blood, phlegm, yellow bile, and black bile. Used in discussions of Galenic theory or historical texts.
四体液説は古代ギリシャの医学理論の一つです。
The theory of the four humors is one of the medical theories of ancient Greece.
中世ヨーロッパでは、四体液のバランスが健康を左右すると考えられていた。
In medieval Europe, it was believed that the balance of the four humors determined health.
Compound of 四 (four) and 体液 (body fluids). The term is a direct translation of the Western concept of the four humors, likely coined in the context of medical history.