directrix
English
Noun
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Eccentricity.svg/220px-Eccentricity.svg.png)
directrix (plural directrixes or directrices)
- A female who directs; a directress.
- (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
Translations
a line used to define a curve or surface
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a female who directs — see directress