Meanings
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1
noun
a small stream or brook, often a shallow channel of water
The rain created a rill that flowed down the hillside.
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2
noun
a narrow, shallow incision on the surface of the ground, typically formed by running water
The landscape was marked by rills carved into the soil.
Thesaurus
Etymology
rill (Modern English, 'small brook or stream'); from Proto-Germanic _rīth-_ ('stream; brook'), via Old High German _rīla_ and Middle High German _rille_ ('small stream').