tro·choid

(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.

trochoid

(ˈtrəʊkɔɪd)

(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

adj

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

tro•choid

(ˈtroʊ kɔɪd)

n.

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.

[1695–1705; < Greek trochoeidḗs round like a wheel. See troche, -oid]

tro•choi′dal, adj.