| trochoid | 1. <geometry> 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 curve while the moving curve rolls without slipping on a second fixed curve, the curves all being in one plane. Cycloids, epicycloids, hypocycloids, cardioids, etc, are all trochoids. 2. <anatomy> Admitting of rotation on an axis; sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column. 3. <marine biology> Top-shaped; having a flat base and conical spire; said of certain shells. 4. <zoology> Of or pertaining to the genus Trochus or family Trochidae. Origin: Gr. A wheel; cf. F. Trochoide. See Troche. (28 Oct 1998) |
|---|---|
| trochoid articulation | A synovial joint in which a section of a cylinder of one bone fits into a corresponding cavity on the other, as in the proximal radioulnar joint. Synonym: articulatio trochoidea, helicoid ginglymus, lateral ginglymus, rotary joint, rotatory joint, trochoid articulation, trochoid joint. (05 Mar 2000) |
| trochoid joint | A synovial joint in which a section of a cylinder of one bone fits into a corresponding cavity on the other, as in the proximal radioulnar joint. Synonym: articulatio trochoidea, helicoid ginglymus, lateral ginglymus, rotary joint, rotatory joint, trochoid articulation, trochoid joint. (05 Mar 2000) |
| trochoidal | 1. <geometry> Of or pertaining to a trochoid; having the properties of a trochoid. 2. <anatomy> See Trochoid. Source: Websters Dictionary (01 Mar 1998) |