MITHRAISM Meaning of MITHRAISM in English [ 'mɪθrəˌɪz(ə)m , 'mɪθreɪ- ]■ noun the cult of the ancient Persian god Mithras, worshipped in the first three centuries AD.DerivativesMithraic -'θreɪɪk adjectiveMithraist noun Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004