Mithras Syllabification: (Mith·ras)Pronunciation: /ˈmiTHˌräs/ MythologyDefinition of Mithras a god of light, truth, and honor, the central figure of the cult of Mithraism but probably of Persian origin. He was also associated with merchants and the protection of warriors. Mithras in other Oxford dictionaries Definition of Mithras in the British & World English dictionary