The Collaborative International Dictionary
Directrix \Di*rect"rix\, n.; pl. E. Directrixes, L. Directrices.
A directress. [R.]
--Jer. Taylor.-
(Geom.)
A line along which a point in another line moves, or which in any way governs the motion of the point and determines the position of the curve generated by it; the line along which the generatrix moves in generating a surface.
A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio to the distance of the same point from the focus.
Wiktionary
n. 1 A female who directs; a directress. 2 (context geometry English) 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.
Wikipedia
In mathematics, a directrix is a curve associated with a process generating a geometric object, such as:
- Directrix (conic section)
- Directrix (generatrix)
- Directrix (rational normal scroll)
Usage examples of "directrix".
Lensman LaForge and I chose to be sworn in aboard the Directrix to show that, according to the recent decision of the Galactic Council, our authority extends over both of the Civilized Galaxies.
Now, as he followed Tregonsee to the Directrix, Kit again Lensed his oldest sister.
It was Kit who, almost immediately after the ultimatum had been received, left the Directrix, boarded a speedster, and drove it at top speed toward far-off Lyrane.
Torlon III proved sterile, and his niece, Valla I, became the first Directrix in 6148.
She was followed by eight more Directors and another Directrix before Vestolian ascended to the Directorship in 6319.
Technically the Z9M9Z, socially the Directrix, ordinarily simply GFHQ, that ship had been built specifically to control the operations of a million separate flotillas.
A parabola, an arc such that each point is equally distant from a directrix and focus.