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 (trō′koid′, trŏk′oid′)
A curve traced by a point on or connected with a circle as the circle rolls along a fixed straight line.
adj. also tro·choi·dal (trō-koid′l, trŏk-oid′l)
1. Capable of or exhibiting rotation about a central axis.
2. Permitting rotation, as a pulley or pivot.

[Greek trokhoeidēs, wheellike : trokhos, wheel; see trochee + -oeidēs, -oid.]

tro·choi′dal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Mathematics) the curve described by a fixed point on the radius or extended radius of a circle as the circle rolls along a straight line
1. (Mathematics) rotating or capable of rotating about a central axis
2. (Anatomy) anatomy (of a structure or part) resembling or functioning as a pivot or pulley
[C18: from Greek trokhoeidēs circular, from trokhos wheel]
troˈchoidally adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtroʊ kɔɪd)

1. 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.
2. rotating on an axis, as a wheel.
[1695–1705; < Greek trochoeidḗs round like a wheel. See troche, -oid]
tro•choi′dal, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
It also forms trochoids diartrosis with the radius in canine and feline that allows supination and pronation (Dyce et al.), which is an important characteristic in primates, since it must allow different positions of the hands to move in the branches of trees or to allow manipulation in humans (Ankel-Simons, 2007).
Thon and Ghazanfarpour [33] used a hybrid approach where the spectrum synthesized using a spectral approach was used to control the trochoids. This was only applicable in the calm sea case.
Gerstner showed that the motion of each water particle is a circle of radius r around a fixed point, giving a wave profile that can be described by a mathematical function called trochoid.