The Collaborative International Dictionary of English v.0.48:

Raiffeisen \Raif"fei`sen\ (r[imac]f"[imac]`z'n), a. (Economics)
   Designating, or pertaining to, a form of cooperative bank
   founded among the German agrarian population by Friedrich
   Wilhelm Raiffeisen (1818-88); as, Raiffeisen banks, the
   Raiffeisen system, etc. The banks are unlimited-liability
   institutions making small loans at a low rate of interest,
   for a designated purpose, to worthy members only.
   [Webster 1913 Suppl.]