Definition of rille Rille
We found 2 definitions of rille from 2 different sources.
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What does rille mean?
Wiktionary 
- rille (Noun)
A long, narrow depression in that resembles a channel, found on the surface of various lunar and planetary bodies.
Webster DictionaryWebster's Unabridged Dictionary 📘
- rille (n.)
One of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon.
