RILL

rill. Rill, v.i. to run in rills or small streams

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Rill (rĭl), n. [[Cf. LG. rille a small channel or brook, a furrow, a chamfer, OE. rigol a small brook, F. rigole a trench or furrow for water, W. rhill a row, rhigol a little ditch. √11.]] 1. 1. A very small brook; a streamlet.
2. 2. (Astron.) See Rille.