“confocal”的英文意思_释义_用法

单词

confocal

释义

confocal, a. and n. Geom.|kənˈfəʊkəl|
[f. con- + focal.]
A. adj. Having the same focus or foci.
1867Thomson & Tait Nat. Phil. §494 Any two confocal homogeneous solid ellipsoids of equal masses produce equal attraction through all space external to both.1881Maxwell Electr. & Magn. I. 215 The general equation of a confocal system.1882Vines Sachs' Bot. 951 If the outline of the growing-point is an ellipse, the periclinals will be confocal ellipses; the anticlinals will be confocal hyperbolas.
B. n. A figure having the same focus as another.
1903Rep. Brit. Assoc. Advancem. Sci. 1902 506 A theorem which of course includes the corresponding proposition for confocals in plano.1961C. C. T. Baker Dict. Math. 70 If two confocals intersect, one must be an ellipse and the other a hyperbola.

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