Why is the ninth month called September?
mid-14c., colrik, "bilious of temperament or complexion," from Old French colerique, from Late Latin cholericus, from Greek kholerikos (see choler). Meaning "easily angered, hot-tempered" is from 1580s (from the supposed effect of excess choler); that of "pertaining to cholera" is from 1834.
choleric chol·er·ic (kŏl'ə-rĭk, kə-lěr'ĭk)
Easily angered; bad-tempered.
Showing or expressing anger.