| 释义 |
conical, a.|ˈkɒnɪkəl|
[f. as prec. + -al1.]
1. Having the form of a cone; cone-shaped.
1570Billingsley Euclid xi. Def. xvii. 318 A Conicall superficies. 1653H. More Conject. Cabbal. (1662) 59 That determinate Conical shadow of the Earth, which is Night. 1677Plot Oxfordsh. 323 Burial under Conical hillocks..was sure very ancient. 1799J. Robertson Agric. Perth 569 The conical summit is covered with grass. 1828Stark Elem. Nat. Hist. I. 448 Jaws armed with a row of conical teeth. 1878Huxley Physiogr. 189. 1880 Gray Struct. Bot. iii. §1. 31 note, Taproots are said..to be..Conical, when tapering regularly..as in carrots.
2. Of, pertaining, or relating to a cone.
conical point: a singular point on a surface at which the tangent lines form a cone. † conical section (also c. line): = conic section (obs.). conical projection: a method of projection (in maps, etc.) in which a part of a spherical surface is projected upon the surface of a tangent or secant cone which is then ‘developed’ or unrolled into a plane. conical refraction: refraction in which a ray is converted into a hollow cone of light.
1570Dee Math. Pref. 34 By Wheles..Conicall Section-lines..at pleasure, may be drawen. 1635N. Carpenter Geog. Del. ii. v. 70 By a Conicall line wee vnderstand a crooked line which differs from a circle, in as much as it keeps not alwayes an equal distance from the center. 1664Power Exp. Philos. Pref. 16 What the Theorists in Conical Sections demonstrate. 1665–6Phil. Trans. I. 105 This motion is Conical and..by the Conick path all the Phænomena of Comets can be readily solved. 1812Woodhouse Astron. xxxv. 336 At the extremity, or conical point of the Earth's shadow. 1866Proctor Handbk. Stars 32 To form separate maps of small parts of the heavens..no method combines simplicity of construction with correctness so satisfactorily as the conical projection. 1871Tyndall Fragm. Sc. (ed. 6) II. viii. 107 As in the case of Conical Refraction..it actually forces upon our attention phenomena which no other eye had previously seen. 1874Salmon Geom. of 3 Dim. (ed. 3) 215 Through a conical point on a surface can be drawn an infinity of lines which will meet the surface in 3 coincident points, and these will all be on a cone of the second degree. 1884C. Smith Solid Geom. §207 When the tangent lines at any point of a surface form a cone, the point is called a conical point.
3. Comb., as conical-shaped, adj.
1868Queen Victoria Life Highl. 145 A curious conical-shaped hill. |