| 单词 |
conoidal |
| 释义 |
conoidal, a.|kəʊˈnɔɪd(ə)l|
[f. prec. + -al1.]
1. Geom. Pertaining to, or of the form of, a conoid (in its various senses).
conoidal cusps (in Optics), the name given by Sir W. R. Hamilton to the singular points or conical points of the wave-surface.
1571Digges Pantom. iv. Pref. T j, Not onely..Theorems of spherall solides, but also of Conoydall, Parabollical, Hyperbollical, and Ellepseycal circumscribed and inscribed bodies. 1837Babbage Bridgw. Treat. viii. 103 The curve surface..had four conoidal cusps at each of which there were, consequently, an infinite number of tangent planes. 1865W. S. Aldis Solid Geom. §144 A conoidal surface is a surface generated by a straight line which always meets a fixed straight line, is parallel to a fixed plane, and meets a fixed curve.
2. in gen. use. Approaching in shape to a cone; nearly but not exactly conical.
1741Monro Anat. (ed. 3) 25 The Figure..is somewhat conoidal. 1842H. Miller O.R. Sandst. xi. (ed. 2) 233 Conoidal hills, bare of soil. 1865Pall Mall G. 29 Aug. 10/2 The new musket, adapted to conoidal shot.
Hence coˈnoidally adv. |
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