Definition:Hyperbola/Transverse Axis

Parts of Hyperbola

Consider a hyperbola $K$ whose foci are $F_1$ and $F_2$.

The transverse axis of $K$ is the line segment joining the vertices of $K$.

In the above diagram, $V_1 V_2$ is the transverse axis of $K$.

Also known as

Many sources give this as the major axis, but at $\mathsf{Pr} \infty \mathsf{fWiki}$ the policy is to use the latter term to mean the (infinite) straight line passing through the vertices and foci of $K$.

Linguistic Note

The plural of axis is axes, which is pronounced ax-eez not ax-iz.

Compare basis.