An Etymological Dictionary of the German Language/Feim
Feim, m., ‘foam,’ from the equiv. MidHG. veim, OHG. feim, m.; comp. the corresponding AS. fâm, E. foam, which are primit. allied to the equiv. Sans. phêna, OSlov. pěna. ModHG. abgefeimt, from an earlier abfeimen, ‘to skim’ (comp. raffiniert, from Fr. raffiner, ‘to refine’).