cycloid
cycloid[ˈsʌɪklɔɪd]noun- (Mathematics)a curve (resembling a series of arches) traced by a point on a circle being rolled along a straight line
(数)旋轮线,摆线
派生cycloidaladjective语源- mid 17th cent.: from Greek kukloeidēs 'circular', from kuklos 'circle'
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