In hillslope geomorphology, a rill is a shallow channel (no more than a few inches / centimeters deep) cut into soil by the erosive action of flowing surface water.

The meaning of RILL is a very small brook.

RILL definition: any of certain long, narrow, straight or sinuous trenches or valleys observed on the surface of the moon. See examples of rill used in a sentence.

Small rivers may be called by several other names, including stream, creek, brook, rivulet, and rill.

6 days ago · A rill is an initial and common form of water erosion, a small channel cut into the soil by the flow of surface water. These features are particularly noticeable on sloped ground after heavy rainfall …

Dec 24, 2025 · rill (third-person singular simple present rills, present participle rilling, simple past and past participle rilled) To trickle, pour, or run like a small stream.

After rills begin forming, they are subjected to variety of other erosional forces which may increase their size and output volume.

There are six meanings listed in OED's entry for the noun rill. See ‘Meaning & use’ for definitions, usage, and quotation evidence. OED's earliest evidence for rill is from before 1552, in the writing of John …

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rill 2 or rille (rɪl) n. any of certain long, narrow trenches or valleys observed on the surface of the moon.