What is the X in X-mas?
c.1300, jaunis, from Old French jaunice, earlier jalnice, "yellowness" (12c.), from jaune "yellow," from Latin galbinus "greenish yellow," probably from PIE *ghel- "yellow, green" (see Chloe).
With intrusive -d- (cf. gender, astound, thunder). Figurative meaning "feeling in which views are colored or distorted" first recorded 1620s, from yellow's association with bitterness and envy (see yellow). As a verb, from 1791, but usually in figurative use. Related: Jaundiced.
jaundice jaun·dice (jôn'dĭs, jän'-)
Yellowish discoloration of the whites of the eyes, skin, and mucous membranes caused by deposition of bile salts in these tissues, occurring as a symptom of various diseases, such as hepatitis, that affect the processing of bile. Also called icterus.
Yellowish discoloration of the whites of the eyes, skin, or mucous membranes caused by the deposition of bile salts in these tissues, occurring as a sign of disorders that interfere with normal metabolism or transport of bile. Liver diseases such as hepatitis commonly cause jaundice.