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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.]
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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.adj.
2. rotating on an axis, as a wheel.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.