A double point at which two (or more) osculating curves are tangent. The above plot shows the
tacnode of the curve .

The capricornoid and links
curve have tacnodes at their origins.

## See also

Acnode,

Capricornoid,

Crunode,

Double Point,

Links Curve,

Osculating
Curves,

Spinode
## Explore with Wolfram|Alpha

## References

Walker, R. J. *Algebraic Curves.* New York: Springer-Verlag, pp. 57-58, 1978.## Referenced
on Wolfram|Alpha

Tacnode
## Cite this as:

Weisstein, Eric W. "Tacnode." From *MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/Tacnode.html

## Subject classifications