Rill Definition
 ril 
  rills
  
    noun
  
 
    rills
  
A little brook; rivulet.
 Webster's New World 
(planetology) Alternative form of rille.
Wiktionary 
    verb
  
 To flow in or like a rill.
 Webster's New World 
To run a small stream.
 Wiktionary 
Other Word Forms of Rill
Noun
Singular:
 rillPlural:
 rillsOrigin of Rill
-  
Low German rille or Dutch ril running stream rei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 
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