Definition of rille in English:

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rille

Pronunciation: /ril/
/ˈrilə/
(also rill)

noun

Astronomy
A fissure or narrow channel on the moon’s surface.
Example sentences
  • He prefers looking in and near smallish craters and the rilles - long, sharp lines or faults.
  • But we know that the Moon is not spherical: rather, it is mountainous in some regions, deep canyons and rills permeating the surface elsewhere, and it is pockmarked with craters, too.

Origin

Mid 19th century: from German (see rill).

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