Rill \Rill\ (r[i^]l), 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. [root]11.]
   1. A very small brook; a streamlet.
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   2. (Astron.) See Rille.
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	Rill \Rill\, v. i.
   To run a small stream. [R.] --Prior.
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	rill
    n 1: a small stream [syn: rivulet, rill, run, runnel,
         streamlet]
    2: a small channel (as one formed by soil erosion)