The story
- Old English · inherited fromreġnwæter
- Middle English · inherited fromreinwater
- English todayrainwater
From Middle English reinwater, from Old English reġnwæter, equivalent to rain + water. Cognate with West Frisian reinwetter, Dutch regenwater, German Regenwasser, Swedish regnvatten.
Etymology from Wiktionary, CC BY-SA 4.0.