trochoid.
/troh-koid/US // ˈtroʊ kɔɪd //UK // (ˈtrəʊkɔɪd) //
蛛丝马迹,鳟鱼状,蛛网状物,蛛丝马迹型
Definitions
n.noun · 名词
- 1.
- ›Geometry. a curve traced by a point on a radius or an extension of the radius of a circle that rolls, without slipping, on a curve, another circle, or a straight line. Equation: x = aθ − b sin θ, y = a − b cos θ.
adj.adjective · 形容词
- 1.
- ›rotating on an axis, as a wheel.
Examples
Then any point in the circumference of the half-crown will move through a curve called a ‘trochoid.’
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