An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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absorption line
  خط ِ درشمی  
xatt-e daršami
Fr.: raie d'absorption  

A dark line in the spectrum of a source produced by a lower temperature gas cloud lying between the source and the observer.

See also: → absorption; → line.