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

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."

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.