An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 2 Search : cylinder
cylinder
  استوانه   
ostovâné (#)

Fr.: cylindre   

The surface traced by one side of a rectangle rotating about its parallel side, the latter serving as axis.

From Fr. cylindre, from L. cylindrus "roller, cylinder," from Gk. kylindros "a cylinder, roller, roll," from kylindein "to roll."

Osotvâné, from sotun "column," Mid.Pers. stun, from O.Pers. stênâ "column," Av. stuna-, Skt. sthuna- "column."

light cylinder
  استوانه‌ی ِ نور   
ostovâne-ye nur

Fr.: cylindre de lumière   

A cylinder of radius cP/(2π) around a → pulsar's spin axis, where P is the pulsar period and c the → speed of light. At this surface, the velocity of a hypothetical object that corotates with the → neutron star would reach the speed of light.

light; → cylinder.