directrix

directrix

English

Noun

In this picture of an ellipse, a parabola, and an hyperbola, the black line is their shared directrix.

directrix (plural directrixes or directrices)

1. A female who directs; a directress.
2. (geometry) 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.

Derived terms

• conic section directrix
• graph directrix
• ruled surface directrix

Translations

a line used to define a curve or surface

Finnish: johtosuora French: directrice (fr) f

Polish: kierownica (pl) f Tamil: இயக்குவரை (ta) f (iyakkuvarai)

a female who directs — see directress

Anagrams

• creditrix