osculation
N การ จูบ การสัมผัส ของ เส้นโค้ง
OSCULATION
n.[L. osculatio, a kissing. ] In geometry, the contract between any given curve and its osculatory circle, that is, a circle of the same curvature with the given curve.
Os `cu *la "tion, n. Etym: [L. osculatio a kissing: cf. F. osculation. ]