trochoid

[troh-koid]

Phonetic (Standard)IPA

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 = ��θ − b sin θ, y = a − b cos θ.

adjective

rotating on an axis, as a wheel.

trochoid

/ ˈ�ٰ�əʊ��ɔɪ�� /

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

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

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Other Word Forms

trochoidal adjective
trochoidally adverb
�ٰ��ˈ��Ǿ��岹�� adverb

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Word History and Origins

Origin of trochoid¹

First recorded in 1695–1705, trochoid is from the Greek word �ٰ��ǳ��Ǳ𾱻�ḗs round like a wheel. See troche, -oid

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Word History and Origins

Origin of trochoid¹

C18: from Greek �ٰ��ǰ��Ǳ𾱻�ŧ�� circular, from trokhos wheel

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Example Sentences

Examples have not been reviewed.

Trochoid, trō′koid, n. the curve traced by a fixed point in a wheel which rolls in a right line.—adjs.

From

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

From

Globigerinidaceae.—Shells vitreous, coarsely perforated; chambers few spheroidal rapidly increasing in size; arranged in a trochoid or nautiloid spiral.

From

X. Rotalidaceae.—Shells vitreous, finely perforate; walls thick, often double, but without an intermediate party-layer traversed by canals; form usually spiral or trochoid.

From

trochlear nerve trochophore

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