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From: Webster's Revised Unabridged Dictionary (1913)

 Cy·lin·dric Cy·lin·dric·al a.  Having the form of a cylinder, or of a section of its convex surface; partaking of the properties of the cylinder.
 Cylindrical lens, a lens having one, or more than one, cylindrical surface.
 Cylindric surface or Cylindrical surface,  Geom., a surface described by a straight line that moves according to any law, but so as to be constantly parallel to a given line.
 Cylindrical vault. Arch. See under Vault, n.
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