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English definition of “cylinder”

cylinder

noun [C]  /ˈsɪl·ən·dər/ us  

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  /səˈlɪn·drɪ·kəl/ us  
geometry cylindrical structures
(Definition of cylinder from the Cambridge Academic Content Dictionary © Cambridge University Press)
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