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Webster 1913 Edition

Directrix

Di-rect′rix

,
Noun.
;
pl. E.
Directrixes
, L.
Directrices
.
1.
A directress.
[R.]
Jer. Taylor.
2.
(Geom.)
(a)
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.
(b)
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.

Webster 1828 Edition

Directrix

DIRECTRIX

,
Noun.
A female who governs or directs.

Definition 2024

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

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