trochoid

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
2.
rotating on an axis, as a wheel.

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

trochoidal, adjective
trochoidally, adverb
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World English Dictionary
trochoid (ˈtrəʊkɔɪd)
 
n
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
 
adj
2.  rotating or capable of rotating about a central axis
3.  anatomy (of a structure or part) resembling or functioning as a pivot or pulley
 
[C18: from Greek trokhoeidēs circular, from trokhos wheel]
 
tro'choidally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

trochoid tro·choid (trō'koid', trŏk'oid') or tro·choi·dal (trō-koid'l, trŏk-oid'l)
adj.

  1. Capable of or exhibiting rotation about a central axis.

  2. Permitting rotation, as a pivot.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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