Rhenish
Concise Oxford English Dictionary © 2008 Oxford University Press:
Rhenish /ˈrɛnɪʃ/
▶adjective of the river Rhine and adjacent regions.
– origin ME: from Anglo-Norman Fr. reneis, from a med. L. alt. of L. Rhenanus, from Rhenus ‘Rhine’.
'Rhenish' also found in these Oxford entries:

