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| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
| rill |
| PRONUNCIATION: |  r l |
| VARIANT FORMS: | also rille |
| NOUN: | 1. A small brook; a rivulet. 2. A long narrow straight valley on the moon's surface. |
| ETYMOLOGY: | Low German rille or Dutch ril, running stream; see rei- in Appendix I. |
| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. | |
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