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Covertex of Ellipse

Let $K$ be an ellipse.

A covertex of $K$ is either one of the endpoints of the minor axis of $K$.

Covertex of Hyperbola

Let $K$ be a hyperbola.

Each of the endpoints of the conjugate axis of $K$ is known as a covertex of $K$.

Linguistic Note

The plural of covertex is covertices.