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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.


(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


(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.
References in periodicals archive ?
Tenders are invited for Supply of Trochoid Oil Pump,Model:Top-1ra-300(3fs Qty: 5
Called 'App Anatomia Humana', the application (Figure 1) is divided in ten tabs: introduction, the joints, conceptual map, morphological types, condylar images, spheroideal images, ginglymus images, plane images, saddle images, and trochoid images.
Knee joint has the feature of both ginglymus and trochoid joint [21].
DRUJ is a diarthrodial trochoid synovial joint relatively new in evolution, evolved from the primitive pectoral fin of early fish to the bipedal primate wrist to its current form in human wrist.
If, in addition, the initial velocity of the particle has no component along the electric field, then the general trajectory of the particle is a trochoid.
Oil flow trochoid (OFT) can denote the frictional stress approximately, through the analysis of oil flow pattern; the whole flow around bodies of revolution characteristic can be obtained.
The geometry of the gear drive and gear driving is obtained using mathematical formulations for a real case of manufacturing, including trochoid form at the tooth foot region.
F] = curvature radius of tooth trochoid at the critical section
Then the observer sees the electron moving on a curve which is a cycloid or trochoid, see Fig.
The ankle, or talocrural joint, is a trochoid synovial joint.