noun
definition
A female who directs; a directress.
definition
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.
Examples of directrices in a Sentence
We may observe that the asymptotes intersect this circle in the same points as the directrices.
In connexion with the " idees directrices et organisatrices," supposed by the French physiologist Claude Bernard, and the universal will supposed by German voluntarists, Fouillee concludes that the world is a society of wills.
Thus it has a real centre, two foci, two directrices and two vertices; the transverse axis, joining the vertices, corresponds to the major axis of the ellipse, and the line through the centre and perpendicular to this axis is called the conjugate axis, and corresponds to the minor axis of the ellipse; about these axes the curve is symmetrical.