| 释义 |
convexity|kənˈvɛksɪtɪ|
[ad. L. convexitās, f. convexus convex: cf. mod.F. convexité.]
1. The quality or condition of being convex; outward bulging.
1605Bacon Adv. Learn. i. vi. §10 The finiteness or convexity of heaven. 1646Sir T. Browne Pseud. Ep. vi. v. 292 By reason of the convexity of the Earth, the eye of man under the æquator cannot discover both the poles. 1794G. Adams Nat. & Exp. Philos. II. xv. 186 If the radius of convexity be less than the radius of concavity, the meniscus will have all the properties of a convex lens. 1880E. White Cert. in Relig. 70 The cornea..is often untrue in its convexity.
2. A convex curve, surface, side, or part.
1600Holland Livy i. ii. 1348 note, Much like a bow full bent: the convexitie or outward compasse whereof containeth a mile. 1703Moxon Mech. Exerc. 220 An Hollow-Mandrel, made fit stifly to receive the convexity of the Globe in its concavity. 1827Carlyle Misc., Richter (1869) 2 This mirror is so twisted with convexities and concavities. 1831Brewster Optics vi. 54 A double convex lens with equal convexities. 1872Baker Nile Tribut. xii. 207, I had taken so steady an aim at the convexity at the root of the tree. |