A lot vs. Alot: 9 Grammatical Pitfalls
"pertaining to the humors of the body," 1520s, from Middle French humoral (14c.), from Latin humor (see humor (n.)).
humoral hu·mor·al (hyōō'mər-əl)adj.
Relating to body fluids, especially serum.
Relating to or arising from any of the bodily humors.