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trochoid

[ troh-koid ]

noun

  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 = b sin θ, y = a b cos θ.


adjective

  1. rotating on an axis, as a wheel.

trochoid

/ ˈtrəʊkɔɪd /

noun

  1. the curve described by a fixed point on the radius or extended radius of a circle as the circle rolls along a straight line
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


adjective

  1. rotating or capable of rotating about a central axis
  2. anatomy (of a structure or part) resembling or functioning as a pivot or pulley
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Derived Forms

  • troˈchoidally, adverb
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Other Words From

  • tro·choidal adjective
  • tro·choidal·ly adverb
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Word History and Origins

Origin of trochoid1

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

Origin of trochoid1

C18: from Greek trokhoeidēs circular, from trokhos wheel
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Example Sentences

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

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