confocaladj.n.

/kənˈfəʊkəl/

Etymology: < con- prefix + focal adj.

Geometry.

A. adj.

Having the same focus or foci.

ΘΚΠ

the world > relative properties > number > geometry > [adjective] > of geometrical relation

reciprocal1570

regular1570

projectivea1652

semi-conjugate axis1743

homographic1859

symmetric1860

confocal1867

correlative1881

involutorial1885

conjugate1902

antisymmetrical1913

homoeomorphic1918

homotopic1918

isometric1952

1867 W. Thomson & P. G. Tait Treat. Nat. Philos. I. §494 Any two confocal homogeneous solid ellipsoids of equal masses produce equal attraction through all space external to both.

1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) I. 215 The general equation of a confocal system.

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 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.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > relationship between figures

perspective1857

homology1863

confocal1903

1903 Rep. Brit. Assoc. Advancem. Sci. 1902 506 A theorem which of course includes the corresponding proposition for confocals in plano.

1961 C. C. T. Baker Dict. Math. 70 If two confocals intersect, one must be an ellipse and the other a hyperbola.

This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2018).

单词	confocal
释义	confocaladj.n. /kənˈfəʊkəl/ Etymology: < con- prefix + focal adj. Geometry. A. adj. Having the same focus or foci. ΘΚΠ the world > relative properties > number > geometry > [adjective] > of geometrical relation reciprocal1570 regular1570 projectivea1652 semi-conjugate axis1743 homographic1859 symmetric1860 confocal1867 correlative1881 involutorial1885 conjugate1902 antisymmetrical1913 homoeomorphic1918 homotopic1918 isometric1952 1867 W. Thomson & P. G. Tait Treat. Nat. Philos. I. §494 Any two confocal homogeneous solid ellipsoids of equal masses produce equal attraction through all space external to both. 1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) I. 215 The general equation of a confocal system. 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 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. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > relationship between figures perspective1857 homology1863 confocal1903 1903 Rep. Brit. Assoc. Advancem. Sci. 1902 506 A theorem which of course includes the corresponding proposition for confocals in plano. 1961 C. C. T. Baker Dict. Math. 70 If two confocals intersect, one must be an ellipse and the other a hyperbola. This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2018). < adj.n.1867
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