An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشهشناختی اخترشناسی-اخترفیزیک
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pencil beam
تابهی ِ باریک
tâbe-ye bârik
Fr.: faisceau étroit
A beam of radiant energy in the form of a narrow cone or cylinder.
See also:
→
pencil
; →
beam
.
