English
hillwash
From hill + wash.
Proto-Indo-European *kl̥Hnís ‘top, hill, rock’
Proto-Germanic *hulliz ‘hill’
Proto-West Germanic *hulli ‘hill’
Old English hyll ‘hill’
Middle English hil ‘hill’
English hill
Proto-Indo-European *wed- ‘wet’
Proto-Germanic *waskaną ‘to wash’
Proto-West Germanic *waskan ‘to wash’
Old English wascan ‘to wash’
Middle English wasshen ‘to wash’
English wash
Today it means
noun sediment that accumulates at the base of a slope
Language periods are conventional ranges, not dates for this word.
Etymograph / hillwash