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English definition of “cylinder”

cylinder

noun [C] (SHAPE)   /ˈsɪl·ən·dər/
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. cylindrical    /səˈlɪn·drɪ·kəl/ adjective geometry cylindrical structures
(Definition of cylinder noun (SHAPE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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