Rill

n. [Either from L. Ger. rille, a small channel or brook, a furrow, a chamfer; or from O. Eng. rigol, a small brook; Fr. rigole, a trench, gutter, ditch, or furrow to convey water; or from Lat. rivulus, a small brook. See RIVULET.] A small brook; a rivulet; a streamlet.