Definition:Ellipse/Vertex

Definition

 * EllipseParts.png

Consider an ellipse $K$.

A vertex of $K$ is either one of the endpoints of the major axis of $K$.

In the above diagram, $\left({-a, 0}\right)$ and $\left({a, 0}\right)$ are the vertices of $K$.

Linguistic Note
The plural of vertex is vertices.

Also see

 * Definition:Covertex of Ellipse