directrix

Etymology

 * equivalent to

Noun



 * 1) A female who directs; a directress.
 * 2)  A line used to define a curve or surface; especially a line, the distance from which a point on a conic has a constant ratio to that from the focus.

Translations

 * Dutch:
 * Finnish: johtosuora
 * French:
 * Polish:
 * Spanish:
 * Tamil: