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The Collaborative International Dictionary
Ditheism

Ditheism \Di"the*ism\, n. [Pref. di- + theism: cf. F. dith['e]isme.] The doctrine of those who maintain the existence of two gods or of two original principles (as in Manicheism), one good and one evil; dualism.

Douglas Harper's Etymology Dictionary
ditheism

"belief in the existence of two gods," 1670s, from di- (1) + theism.

Wiktionary
ditheism

n. A belief in two deities, which may be in conflict with each other.