rill
NounWordNet 3.0
Webster's Dictionary (GCIDE)
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. [1913 Webster]
2.(Astron.) See Rille. [1913 Webster]
Rill \Rill\, v. i. To run a small stream. [R.] --Prior. [1913 Webster]