The Collaborative International Dictionary
Euhemerism \Eu*hem"er*ism\n. [L. Euhemerus, Gr. ? a philosopher, about 300 ?.] The theory, held by Euhemerus, that the gods of mythology were but deified mortals, and their deeds only the amplification in imagination of human acts.
Douglas Harper's Etymology Dictionary
1846, "the method of regarding myths as glorified accounts of actual events or persons," with -ism + name of Euhemerus, Greek philosopher of Sicily (4c. B.C.E.), who wrote "Iera Anagraphe," in which he maintained the Greek deities actually were historical mortals. His name is literally "good day," from eu "well, good" (see eu-) + hemera "day" (see ephemera). Related: Euhemerist; euhemeristic.
Wiktionary
n. A belief attributing the origins of the gods to the deification of heroes after their deaths.
Wikipedia
Euhemerism is an approach to the interpretation of mythology in which mythological accounts are presumed to have originated from real historical events or personages. Euhemerism supposes that historical accounts become myths as they are exaggerated in the retelling, accumulating elaborations and alterations that reflect cultural mores. It was named for the Greek mythographer Euhemerus. In more recent literature of myth, such as Bulfinch's Mythology, euhemerism is termed the "historical theory" of mythology.
Euhemerus was not the first to attempt to rationalize mythology in historical terms, as euhemeristic views are found in earlier writings including those of Xenophanes, Herodotus, Hecataeus of Abdera and Ephorus. However, the enduring influence of Euhemerus upon later thinkers such as Ennius and Antoine Banier identified him as the traditional founder of this school of thought.
Usage examples of "euhemerism".
The theory that most or all gods originated after this fashion, in other words, that the worship of the gods is little or nothing but the worship of dead men, is known as Euhemerism from Euhemerus, the ancient Greek writer who propounded it.
Then of an event, an argument, a dialectic euhemerism, protoplasmic or blastodermic?