An Etymological Dictionary of the German Language/Annotated/Rasen

by Friedrich Kluge

Rasen, masculine, from the equivalent late Middle High German rase, masculine, ‘turf, sward’; compare Middle Low German wrase, Low German frasen. The word is wanting in the other dialects (Gothic *wrasa may perhaps be assumed); in Upper German Wasen, which is primitively cognate with the primary form wrasa.