oscnoden.
/ˈɒsknəʊd/, U.S. /ˈɑskˌnoʊd/ Geometry.
A node of a plane curve at which three branches meet, two of which have a common tangent there.
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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 in Coll. Math. Papers (1889) II. 28 The oscnode is a double point which is a point of osculation on one of the branches through it.
1873 G. Salmon Treat. Higher Plane Curves 207 Three nodes may coincide as consecutive points of a curve of finite curvature giving rise not to a triple point but to the singularity called an oscnode, this is in fact an osculation or three-pointic contact of two branches of the curve.
1937 Amer. Jrnl. Math. 59 937 Each biflecnode or oscnode counts for three ordinary double points, i.e. contains two latent bitangents.
1978 Philos. Trans. (Royal Soc.) A. 289 241 We shall be mainly concerned with the double points An: for example, A1 is a simple node, A2 a cusp, A3 a tacnode, A4 a rhamphoidal cusp and A5 an oscnode.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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n.1852