RHENISH Meaning of RHENISH in English [ 'rɛnɪʃ ]■ adjective of the river Rhine and adjacent regions.OriginME: from Anglo-Norman Fr. reneis , from a med. L. alt. of L. Rhenanus , from Rhenus 'Rhine'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004