Dictionary
rill
Pronunciation: (ril), [key]—
n.
a small rivulet or brook.
rill
Pronunciation: (ril), [key]—
n. Astron.
any of certain long, narrow, straight or sinuous trenches or valleys observed on the surface of the moon.
Also,rille.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.