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 = ab cos θ.

adjective
  1. rotating on an axis, as a wheel.

Origin of trochoid

1
First recorded in 1695–1705, trochoid is from the Greek word trochoeidḗs round like a wheel. See troche, -oid

Other words from trochoid

  • tro·choi·dal, adjective
  • tro·choi·dal·ly, adverb

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British Dictionary definitions for trochoid

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

adjectiveAlso: trochoidal
  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

Origin of trochoid

1
C18: from Greek trokhoeidēs circular, from trokhos wheel

Derived forms of trochoid

  • trochoidally, adverb

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