An Etymological Dictionary of the German Language/Ries
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Ries, n., ‘ream,’ from the equiv. late MidHG. ris (riȥ, rist), m., f. and n.; in Du. riem, E. ream. These late Teut. cognates are borrowed from Rom.; comp. the equiv. MidLat. and Ital. risma, Fr. rame. It is true that the MidHG. form still requires further explanation. The ultimate source of MidLat. and Ital. risma is Arab. rizma, ‘bale, bundle,’ espec. ‘packing-paper.’