spinoden.

/ˈspʌɪnəʊd/

Etymology: Irregularly < Latin spīna spine + node n.

Geometry.

A stationary point on a curve; a cusp.

ΘΚΠ

the world > relative properties > number > geometry > point > [noun] > on a curve

first polar1836

umbilic1843

spinode1852

stationary point1856

ineunt1859

triple point1872

tacnode-cusp1873

1852 A. Cayley Coll. Math. Papers (1889) II. 28 I shall, with reference to plane curves,..use the term ‘node’ as synonymous with double point, and the term ‘spinode’ as synonymous with cusp.

1873 G. Salmon Treat. Higher Plane Curves (ed. 2) ii. 23 Such points are called cusps or spinodes. They are also..called stationary points.

attributive.1852 A. Cayley Coll. Math. Papers (1889) II. 29 The spinode-planes give rise to a developable which may be termed the ‘spinode-develope’. Also the ‘spinode-tangent’ is the tangent to the curve of intersection at the spinode.1869 A. Cayley Coll. Math. Papers (1893) VI. 450 The spinode curve of the cubic surface.1869 A. Cayley Coll. Math. Papers (1893) VI. 584 The spinode torse is the envelope of the parabolic planes of the surface.

This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2018).

单词	spinode
释义	spinoden. /ˈspʌɪnəʊd/ Etymology: Irregularly < Latin spīna spine + node n. Geometry. A stationary point on a curve; a cusp. ΘΚΠ the world > relative properties > number > geometry > point > [noun] > on a curve first polar1836 umbilic1843 spinode1852 stationary point1856 ineunt1859 triple point1872 tacnode-cusp1873 1852 A. Cayley Coll. Math. Papers (1889) II. 28 I shall, with reference to plane curves,..use the term ‘node’ as synonymous with double point, and the term ‘spinode’ as synonymous with cusp. 1873 G. Salmon Treat. Higher Plane Curves (ed. 2) ii. 23 Such points are called cusps or spinodes. They are also..called stationary points. attributive.1852 A. Cayley Coll. Math. Papers (1889) II. 29 The spinode-planes give rise to a developable which may be termed the ‘spinode-develope’. Also the ‘spinode-tangent’ is the tangent to the curve of intersection at the spinode.1869 A. Cayley Coll. Math. Papers (1893) VI. 450 The spinode curve of the cubic surface.1869 A. Cayley Coll. Math. Papers (1893) VI. 584 The spinode torse is the envelope of the parabolic planes of the surface. This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2018). < n.1852
随便看	malefactious malefactor malefactors malefactory malefactress malefacture maleffect malefic malefical malefically maleficate malefice maleficence maleficences maleficent malefices maleficial maleficiate maleficiated maleficiating maleficiation maleficious maleficiousness maleficium maleficness