the GNU version of the Collaborative International Dictionary of English
n. A very small brook; a streamlet.
n. See Rille.
verb-intransitive. To run a small stream.
The Century Dictionary and Cyclopedia
n. A small brook; a rivulet; a streamlet.
n. A deep, winding valley on the moon.
To flow in a small stream or rill; run in streamlets; purl.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a small stream
n. a small channel (as one formed by soil erosion)
Word Usage
"She was not sure whether a rill was a fountain or a stream, so she decided, as there was no dictionary convenient, to think of it as like the creek where it crossed the road at the foot of Red Hill."