noun
cylinder
SIL-in-dur/ˈsɪlɪndər/
A solid or hollow object with straight sides and two equal circular ends.
The solid cylinder has straight sides and matching circular ends.

Etymology
Greek kylindros meant a roller or cylinder and came from a verb meaning “to roll.” The geometric meaning preserves that rolling shape, with its circular ends and curved side.
In context
a yarn will never ever be a mathematically perfect cylinder. So, these metrics calculate the ratio of maximum to minimum diameters along the yarn's length to detect any mass variations.
More examples
- The oxygen cylinder stands upright beside the bed.
- We cut the wooden dowel into short cylinders.
- Wires pass through the hollow metal cylinder.
Forms
cylinder · cylinders
cylindrical adjective — Having straight sides and equal circular ends.
Similar words
- tube
- Usually hollow and open-ended; a cylinder can also be solid.
- roller
- A cylinder designed to rotate, often for moving or smoothing.