A long narrow straight valley on the moon's surface.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "rill" in a sentence
"Brunswick are to her what the railroads are now to other countries: and richly is she blessed with sparkling waters from the diamond flashings of the mountain rill to the still calm beauty of the sheltered lake, the silvery streams, the sweeping river, and the unfrozen width of the winter harbour of her noble bay."
"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."
"By the third rill, which is an inpouring heat, the supreme will has been enkindled in tranquil love, and has been endowed with great riches."