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Rhenish

"of or belonging to the River Rhine or its region," late 14c., Rinish, from Rine, or from Anglo-French reneis (13c.) or Medieval Latin Rhenensis, from Rhenus (see Rhine). Also partly from continental German forms such as Middle Low German rinish (German rheinisch). Originally and especially of wine, later also of architecture, etc.  

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Definitions of Rhenish from WordNet
1
Rhenish (n.)
any of several white wines from the Rhine River valley in Germany (`hock' is British usage);
Synonyms: Rhine wine / hock
2
Rhenish (adj.)
of or relating to the Rhine River and the lands adjacent to it;
From wordnet.princeton.edu