Definition of Latus Rectum:
The latus rectum is a chord (line segment) through the focus of a conic section (parabola, ellipse, or hyperbola) that is parallel to the directrix.
The term “latus rectum” is derived from Latin: “latus” means “side,” and “rectum” means “straight.”
Half of the latus rectum is called the semi-latus rectum.