The Collaborative International Dictionary of English v.0.48:

Cylinder \Cyl"in*der\ (s?l"?n-d?r), n. [F. cylindre, OF.
   cilindre, L. cylindrus, fr. Gr. ky`lindros, fr. kyli`ndein,
   kyli`ein, to roll. Cf. Calender the machine.]
   [1913 Webster]
   1. (Geom.)
      (a) A solid body which may be generated by the rotation of
          a parallelogram round one its sides; or a body of
          rollerlike form, of which the longitudinal section is
          oblong, and the cross section is circular.
      (b) The space inclosed by any cylindrical surface. The
          space may be limited or unlimited in length.
          [1913 Webster]

   2. Any hollow body of cylindrical form, as:
      (a) The chamber of a steam engine in which the piston is
          moved by the force of steam.
      (b) The barrel of an air or other pump.
      (c) (Print.) The revolving platen or bed which produces
          the impression or carries the type in a cylinder
          press.
      (d) The bore of a gun; the turning chambered breech of a
          revolver.
          [1913 Webster]

   3. The revolving square prism carrying the cards in a
      Jacquard loom.
      [1913 Webster]

   Cylinder axis. (Anat.) See Axis cylinder, under Axis.


   Cylinder engine (Paper Making), a machine in which a
      cylinder takes up the pulp and delivers it in a continuous
      sheet to the dryers.

   Cylinder escapement. See Escapement.

   Cylinder glass. See Glass.

   Cylinder mill. See Roller mill.

   Cylinder press. See Press.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cylinder
    n 1: a solid bounded by a cylindrical surface and two parallel
         planes (the bases)
    2: a surface generated by rotating a parallel line around a
       fixed line
    3: a chamber within which piston moves [syn: cylinder, piston
       chamber]
    4: a cylindrical container for oxygen or compressed air

The Free On-line Dictionary of Computing (30 December 2018):

cylinder

    The set of tracks on a multi-headed disk that
   may be accessed without head movement.  That is, the
   collection of disk tracks which are the same distance from the
   spindle about which the disks rotate.  Each such group forms
   the shape of a cylinder.  Placing data that are likely to be
   accessed together in cylinders reduces the access
   significantly as head movement (seeking) is slow compared to
   disk rotation and switching between heads.

   (1997-07-15)


U.S. Gazetteer Places (2000):

Cylinder, IA -- U.S. city in Iowa
   Population (2000):    110
   Housing Units (2000): 49
   Land area (2000):     0.067690 sq. miles (0.175317 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.067690 sq. miles (0.175317 sq. km)
   FIPS code:            17985
   Located within:       Iowa (IA), FIPS 19
   Location:             43.089159 N, 94.550092 W
   ZIP Codes (1990):     50528
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Cylinder, IA
    Cylinder