**Trochoid** — Tro choid, n. [Gr. ? a wheel + oid; cf. F. trocho[ i]de. See {Troche}.] (Geom.) The curve described by any point in a wheel rolling on a line; a cycloid; a roulette; in general, the curve described by any point fixedly connected with a moving… … The Collaborative International Dictionary of English

**Trochoid** — Tro choid, a. 1. (Anat.) Admitting of rotation on an axis; sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column. [1913 Webster] 2. (Zo[ o]l.) Top shaped; having a flat base and conical spire; said of… … The Collaborative International Dictionary of English

**trochoid** — [trō′koid΄] n. [< Gr trochoeides, round like a wheel < trochos (see TROCHE) + eidos, OID] Geom. any cycloid adj. having a wheel like rotary motion on an axis, as a joint: also trochoidal … English World dictionary

**Trochoid** — [ thumb|290px|right|A cycloid (a common trochoid) generated by a rolling circle] Trochoid is the word created by Gilles de Roberval for the curve described by a fixed point as a circle rolls along a straight line. As a circle of radius a rolls… … Wikipedia

**trochoid** — [ trəʊkɔɪd] adjective 1》 Anatomy denoting a joint in which one element rotates on its own axis (e.g. the atlas vertebra). 2》 Geometry denoting a curve traced by a point on a radius of a circle rotating along a straight line or another circle. 3》… … English new terms dictionary

**trochoid** — adj. & n. adj. 1 Anat. rotating on its own axis. 2 Geom. (of a curve) traced by a point on a radius of a circle rotating along a straight line or another circle. n. a trochoid joint or curve. Derivatives: trochoidal adj. Etymology: Gk trokhoeides … Useful english dictionary

**trochoid joint** — noun see trochoid I, 2 … Useful english dictionary

**trochoid** — noun Etymology: Greek trochoeidēs like a wheel, from trochos wheel Date: circa 1704 the curve generated by a point on the radius of a circle or the radius extended as the circle rolls on a fixed straight line • trochoidal adjective … New Collegiate Dictionary

**trochoid** — trochoidal, adj. trochoidally, adv. /troh koyd/, n. 1. Geom. 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 = a t b sin(t) … Universalium

**trochoid** — 1. noun The curve traced by a point on a circle as it rolls along a straight line 2. adjective a) capable of rolling b) allowing … Wiktionary