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trochoid

[troh-koid]
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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.
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adjective
  1. rotating on an axis, as a wheel.
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Origin of trochoid

First recorded in 1695–1705, trochoid is from the Greek word trochoeidḗs round like a wheel. See troche, -oid
Related formstro·choi·dal, adjectivetro·choi·dal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for trochoid

Historical Examples

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

    Boating

    W. B. Woodgate


British Dictionary definitions for trochoid

trochoid

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
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adjective Also: 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
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Derived Formstrochoidally, adverb

Word Origin

C18: from Greek trokhoeidēs circular, from trokhos wheel
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

trochoid in Medicine

trochoid

(trōkoid′, trŏkoid′)
adj.
  1. Capable of or exhibiting rotation about a central axis.
  2. Permitting rotation, as a pivot.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.