An Etymological Dictionary of the German Language/Rasen
Appearance
Rasen, m., from the equiv. late MidHG. rase, m., ‘turf, sward’; comp. MidLG. wrase, LG. frasen. The word is wanting in the other dials. (Goth. *wrasa may perhaps be assumed); in UpG. Wasen, which is primit. cognate with the primary form wrasa.