1 [ril]
a small rivulet or brook.

1530–40; < Dutch or Low German; compare Frisian ril Unabridged


2 [ril]
noun Astronomy.
any of certain long, narrow, straight or sinuous trenches or valleys observed on the surface of the moon.
Also, rille.

1885–90; < German Rille; see rill1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rill (rɪl)
1.  a brook or stream; rivulet
2.  a small channel or gulley, such as one formed during soil erosion
3.  Also: rille one of many winding cracks on the moon
[C15: from Low German rille; related to Dutch ril]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"small brook, rivulet," 1538, from Du. ril, Low Ger. rille "groove, furrow, running stream," probably from P.Gmc. *riðele (cf. O.E. rið, riþe "brook, stream," which survives only in obscure Eng. dialects), a diminutive form from PIE base *reie- "to run, flow" (see Rhine).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Continued rainfall will enlarge the rill network and more substantial channels and gullies will form.
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