The terms “sanguine”, “melancholic”, “choleric” and “phlegmatic” are still commonly used in English, but they are based on medical theories that became obsolete centuries ago.
Any other terms that are still commonly used that have their origin in defunct scientific theories ? I’ve occasionally heard reference to “the ether” but I’d hardly call it a commonly used term.
“hysteria” - Hippocratic medicine
“quintessential” -classical elements
“sunrise/sunset/solstice” - geocentric theory
“disaster” - astrology
“cold” (the disease caused by a viral infection, not by cold)
“malaria” (the disease caused by a bacterial infection, not by “bad air”)
Technically, there are two types of anal personalities in Freud’s theories. Anal-retentive is the one that we currently incorporate into our lexicon. The other, anal-expulsive, isn’t used.
“quintessence” is the “quinta essentia” or fifth element, which is heavenly, pure and immutable unlike the mundane 4 elements of earth, air, water and fire.
“disaster” (like the equivalent concepts, “ill-starred” and “star-crossed”) comes from the idea that the alignment of heavenly bodies determines your fate. It originates in Italian “disastrato” where “dis-” is a prefix with the same meaning as in English and “-astrato” means “starred”.
I’m not sure I agree that any of these, except sanguine, are commonly used, but terms linked to them certainly are. . . Melancholy, cholera, phlegm, etc.
Anyway, that said, I got nothin’ else. The ones others have found though, are interesting.
This is interesting because the name was coined well after the theory it refers to was debunked. I can’t think of any other term that fits that criterion.
Its not relevant to the OP, but the paper quoted in the wiki article made the point that any affect would be cancelled out by electric lighting so could not be observable in modern society (hence why, as Cecil points out, there is no link between lunar cycles and mental problems nowadays).