Did You Know?
"Bilious" is one of several words whose origins trace to the old belief that four bodily humors (black bile, yellow bile, phlegm, and blood) control temperament. Just like "phlegmatic" ("of a slow and stolid phlegm-driven character"), "melancholy" ("experiencing dejection associated with black bile"), and the recent Word of the Day "sanguine" ("of a cheerful, blood-based disposition"), "bilious" suggests a personality associated with an excess of one of the humors -- in this case, yellow bile. "Bilious," which first appeared in English in the mid-1500s, derives from the Middle French "bilieux," which in turn traces to "bilis," Latin for "bile." In the past, "bile" was also called "choler," which gives us "choleric," a synonym of "bilious."