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. A very small brook; a streamlet.
2. (Astron.) See Rille.
Webster's Dictionary 1913
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. A very small brook; a streamlet.
2. (Astron.) See Rille.