oscnodes

Noun

oscnode (plural oscnodes)

1. A node of a plane curve where two branches meet with contact order 3.
   • 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.1879, George Salmon, A Treatise on the Higher Plane Curves, page 214