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anaesthetic (adj.)[anaesthetic 词源字典]: 1846, "insensible," from Greek anaisthetos "insensate, without feeling; senseless, stupid" (see anaesthesia). Noun meaning "agent that produces anesthesia" first used in modern sense 1848 by Scottish doctor James Young Simpson (1811-1870), discoverer of the surgical uses of chloroform.[anaesthetic etymology, anaesthetic origin, 英语词源]
myth (n.): 1830, from French Mythe (1818) and directly from Modern Latin mythus, from Greek mythos "speech, thought, story, myth, anything delivered by word of mouth," of unknown origin.
Myths are "stories about divine beings, generally arranged in a coherent system; they are revered as true and sacred; they are endorsed by rulers and priests; and closely linked to religion. Once this link is broken, and the actors in the story are not regarded as gods but as human heroes, giants or fairies, it is no longer a myth but a folktale. Where the central actor is divine but the story is trivial ... the result is religious legend, not myth." [J. Simpson & S. Roud, "Dictionary of English Folklore," Oxford, 2000, p.254]
General sense of "untrue story, rumor" is from 1840.