or rille

[ ril ]
/ rɪl /

noun Astronomy.

any of certain long, narrow, straight or sinuous trenches or valleys observed on the surface of the moon.

Nearby words

  1. riley, james whitcomb,
  2. riley-day syndrome,
  3. rilievo,
  4. rilke,
  5. rilke, rainer maria,
  6. rille,
  7. rillet,
  8. rillettes,
  9. rim,
  10. rim lighting

Origin of rill

1885–90; < German Rille; see rill1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rille

British Dictionary definitions for rille


/ (rɪl) /


a brook or stream; rivulet
a small channel or gulley, such as one formed during soil erosion
Also: rille one of many winding cracks on the moon

Word Origin for rill

C15: from Low German rille; related to Dutch ril

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for rille



"small brook, rivulet," 1530s, from or related to Dutch and Frisian ril, Low German rille "groove, furrow, running stream," probably from Proto-Germanic *ril- (cf. Old English rið, riþe "brook, stream," which survives only in dialects), a diminutive form from PIE root *reie- "to run, flow" (see Rhine).

Online Etymology Dictionary, © 2010 Douglas Harper