tacnoden.

/ˈtaknəʊd/

Etymology: < Latin tac-tus touch + node n.

Geometry.

A point at which two parts of the same curve have ordinary contact.

ΘΚΠ

the world > relative properties > number > geometry > point > [noun] > of intersection or contact > of specific lines or curves

cuspis1646

focus1656

point of reflection1674

umbilicus1704

cuspid1743

cusp1758

rhamphoid1814

biplanar1849

oscnode1852

tacnode1852

tangential of a point1858

cnicnode1869

uniplane1869

unode1869

1852 A. Cayley Coll. Math. Papers (1889) II. 28 The tacnode is a double point where two branches touch.

1873 G. Salmon Treat. Higher Plane Curves (ed. 2) vi. 207 Two nodes may coincide, giving rise to the singularity called a tacnode; this is, in fact, an ordinary (two-pointic) contact of two branches of the curve.

Compounds

ˈtacnode-ˈcusp n. the singularity of a curve which arises when a cusp and an immediately following tangency of the two branches coalesce.

ΘΚΠ

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

first polar1836

umbilic1843

spinode1852

stationary point1856

ineunt1859

triple point1872

tacnode-cusp1873

1873 G. Salmon Treat. Higher Plane Curves (1879) 207.

This entry has not yet been fully updated (first published 1910; most recently modified version published online June 2018).

单词	tacnode
释义	tacnoden. /ˈtaknəʊd/ Etymology: < Latin tac-tus touch + node n. Geometry. A point at which two parts of the same curve have ordinary contact. ΘΚΠ the world > relative properties > number > geometry > point > [noun] > of intersection or contact > of specific lines or curves cuspis1646 focus1656 point of reflection1674 umbilicus1704 cuspid1743 cusp1758 rhamphoid1814 biplanar1849 oscnode1852 tacnode1852 tangential of a point1858 cnicnode1869 uniplane1869 unode1869 1852 A. Cayley Coll. Math. Papers (1889) II. 28 The tacnode is a double point where two branches touch. 1873 G. Salmon Treat. Higher Plane Curves (ed. 2) vi. 207 Two nodes may coincide, giving rise to the singularity called a tacnode; this is, in fact, an ordinary (two-pointic) contact of two branches of the curve. Compounds ˈtacnode-ˈcusp n. the singularity of a curve which arises when a cusp and an immediately following tangency of the two branches coalesce. ΘΚΠ the world > relative properties > number > geometry > point > [noun] > on a curve first polar1836 umbilic1843 spinode1852 stationary point1856 ineunt1859 triple point1872 tacnode-cusp1873 1873 G. Salmon Treat. Higher Plane Curves (1879) 207. This entry has not yet been fully updated (first published 1910; most recently modified version published online June 2018). < n.1852
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