directrix: A line used to construct and define a conic section; a parabola has one directrix; ellipses and hyperbolas have two (plural: directrices).

What is the definition of Directrix of ellipse?

Two parallel lines on the outside of an ellipse perpendicular to the major axis.

Do ellipses have Latus Rectum?

Latus rectum of the ellipse is defined as the length of the line segment perpendicular to the major axis passing through any of the foci and whose endpoint lies on the ellipse. The length of the latus rectum of an ellipse is 2b²/ a.