| 释义 |
ˌsemi-eˈllipse
[semi- 7 a.]
The half of an ellipse bisected by one of its diameters (usually the transverse).
1733Tull Horse-Hoeing Husb. xxii. 344 The two Semi-Ellipses, which are on the Fore-sides of their longest Axes or Diameters. 1841Miller Old Red Sandstone viii. (1887) 150 The convex or sharpened edge is elongated into a semi-ellipse cut in the line of its shortest diameter. a1878Sir G. Scott Lect. Archit. (1879) I. 57 To make the section of the narrower vault an upright semi-ellipse.
So ˌsemi-eˈllipsis (hence ˌsemi-eˈlliptic, -eˈlliptical adjs.); semi-ellipˈsoidal a., of the form of half an ellipsoid.
1767Ferguson in Phil. Trans. LVII. 392 Right lines..shall cut the *semi-ellipsis in those points through which the hour-lines must be drawn.
1833–4J. Phillips in Encycl. Metrop. (1845) VI. 703/1 The Yorkshire flagstone is..used, to make curb stones of two feet in height, the laminæ being placed vertically, and the block worked above to a *semi-ellipsoidal figure.
1900B. D. Jackson Gloss. Bot. Terms, *Semielliptic, half-elliptic, the division being longitudinal. 1907Westm. Gaz. 11 Nov. 6/3 The suspension of the rear part of the chassis is now by three-quarter elliptical springs instead of semi-elliptics.
1762Ann. Reg. 75 A bright semicircular or *semielliptical arch over the moon. 1841Miller Old Red Sandstone viii. (1887) 166 They remind one..of pieces of ancient iron armour, fitted into semi-elliptical scales. 1866R. Tate Brit. Mollusks iv. 128 The aperture is oblique, semielliptical, thin. |