trochoid

[ troh-koid ]
/ ˈtroʊ kɔɪd /

noun

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 = aθ − b sin θ, y = a − b cos θ.

adjective

rotating on an axis, as a wheel.

Origin of trochoid

First recorded in 1695–1705, trochoid is from the Greek word trochoeidḗs round like a wheel. See troche, -oid

OTHER WORDS FROM trochoid

tro·choi·dal, adjective tro·choi·dal·ly, adverb

Words nearby trochoid

trochilus, trochlea, trochlear, trochlear nerve, trochlear spine, trochoid, trochoid joint, trochophore, trod, trodden, trode

Example sentences from the Web for trochoid

  • Then any point in the circumference of the half-crown will move through a curve called a ‘trochoid.’

    Boating |W. B. Woodgate

British Dictionary definitions for trochoid

trochoid
/ (ˈtrəʊkɔɪd) /

noun

the curve described by a fixed point on the radius or extended radius of a circle as the circle rolls along a straight line

adjective Also: trochoidal

rotating or capable of rotating about a central axis
anatomy (of a structure or part) resembling or functioning as a pivot or pulley

Derived forms of trochoid

trochoidally, adverb

Word Origin for trochoid

C18: from Greek trokhoeidēs circular, from trokhos wheel

Medical definitions for trochoid

trochoid
[ trō′koid′, trŏk′oid′ ]

adj.

Capable of or exhibiting rotation about a central axis.
Permitting rotation, as a pivot.