Definition of cylinder
1 a
:the surface traced by a straight line moving parallel to a fixed straight line and intersecting a fixed planar closed curve
b
:a solid or surface bounded by a cylinder and two parallel planes cutting all its elements;
especially
:right circular cylinder — see Volume Formulas Table
2
:a cylindrical body or space: such as
a
:the turning chambered breech of a revolver
b (1)
:the piston chamber in an engine
(2)
:a chamber in a pump from which the piston expels the fluid
c
:any of various rotating members in a press (such as a printing press);
especially
:one that impresses paper on an inked form
d
:a cylindrical clay object inscribed with cuneiform inscriptions
—
on all cylinders
:with maximum effort or intensity :at full capacity or speed
- the economy is running on all cylinders
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