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cylinder
mastery UK /ˈsɪlɪndə(ɹ)/ US /ˈsɪləndɚ/nounverb
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What does 'cylinder' primarily refer to in this passage?
When the two-dimensional curve is a circle, the cylinder is called a circular cylinder. When the axis is perpendicular to the plane of the curve, the cylinder is called a right cylinder. In non-mathematical usage, both right and circular are usually implied.