Euhemerism is defined as the theory of the Greek writer Euhemerus that the Greek gods were created from real stories about humans and historical events.(noun)
An example of euhemerism is imagining that characteristics of Zeus are based on the actions of a real person.
See euhemerism in Webster's New World College Dictionary
Origin: < L Euhemerus (< Gr Euhēmeros) + -ism
See euhemerism in American Heritage Dictionary 4
Origin: After Euhemerus, fourth-century B.C. Greek philosopher.