An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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rille
  ریل  
ril
Fr.:  

A long, narrow, straight or sinuous trench or valley with steep walls and roughly parallel sides on the surface of the Moon.

Etymology (EN): From Ger. Rille “a small rivulet or brook.”

Etymology (PE): Borrowed from E., as above.