Meaning of “cylinder” in the English Dictionary

"cylinder" in American English

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cylindernoun [ C ]

us /ˈsɪl·ən·dər/

cylinder noun [ C ] (SHAPE)

geometry a solid that has long straight sides and circular ends of equal size, or a hollow object shaped like this and often used as a container:

Inside a roll of paper towels there’s a cardboard cylinder.

cylinder noun [ C ] (ENGINE PART)

the tube-shaped part of an engine inside of which the piston (= part that causes the fuel to produce power) moves up and down:

The engine isn’t firing on all its cylinders.
cylindrical
adjective us /səˈlɪn·drɪ·kəl/

geometry

cylindrical structures

(Definition of “cylinder” from the Cambridge Academic Content Dictionary © Cambridge University Press)