trochoid

[ troh-koid ]

Phonetic (Standard)IPA

noun

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.

trochoid

/ ˈtrəʊkɔɪd /

the curve described by a fixed point on the radius or extended radius of a circle as the circle rolls along a straight line

First recorded in 1695–1705, trochoid is from the Greek word trochoeidḗs round like a wheel. See troche, -oid

C18: from Greek trokhoeidēs circular, from trokhos wheel

Then any point in the circumference of the half-crown will move through a curve called a ‘trochoid.’

April 19, 2024tortuous

[tawr-choo-uhs ]

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