early 15c., "exposition of myths, the investigation and interpretation of myths," from Late Latin mythologia, from Greek mythologia "legendary lore, a telling of mythic legends; a legend, story, tale," from mythos "myth" (a word of unknown origin; see myth) + -logia (see -logy "study"). Meaning "a body or system of myths" is recorded by 1781.
1610s, "relating to mythology; of the nature of a myth," from Late Latin mythologicus, from Greek mythologikos "pertaining to legendary lore," from mythologia (see mythology). Related: Mythologically.
c. 1600, "to make into a myth," from French mythologizer, from mythologie, from Late Latin mythologia (see mythology). From 1847 as "to render mythical." Related: Mythologized; mythologizing; mythologization.