¹ *Source: wiktionary.com*

### Definition of Directrices

**1.** directrix [n] - See also: directrix

### Lexicographical Neighbors of Directrices

### Literary usage of Directrices

Below you will find example usage of this term as found in modern and/or classical literature:

**1.** *Proceedings of the Royal Society of London* by Royal Society (Great Britain) (1865)

"These axes, meeting themselves the axis of the congruency, are its **directrices**.
A linear congruency, depending upon eight constants, is fully determined by ..."**2.** *The Elements of Descriptive Geometry: Shadows and Perspective. With a Brief* by Samuel Edward Warren (1877)

"To construct tlie projections of a hyperbolic paraboloid, having given the
**directrices** and plane director of one generation. In Space. ..."**3.** *The Elements of the Differential Calculus: Comprehending the General Theory* by John Radford Young, Michael O'Shannessy (1833)

"Proceeding from the simpler kinds to the more general, we shall first examine
the surfaces whose **directrices** are straight lines as well as the generatrices, ..."**4.** *Plane Analytic Geometry: With Introductory Chapters on the Differential Calculus* by Maxime Bôcher (1915)

"Consequently, the equations of the two **directrices** of the ellipse or hyperbola
are (1) *-±2. It will be seen that the more nearly circular the ellipse, ..."**5.** *Descriptive Geometry* by Gardner Chace Anthony, George Francis Ashley (1909)

"Having given three curvilinear **directrices** and a point on one of them, it is
required to determine the two projections of the element of the warped surface ..."**6.** *The Elements of the Differential Calculus; Comprehending the General Theory* by John Radford Young, Michael O'Shannessy (1833)

"Proceeding from the simpler kinds to the more general, we shall first examine
the surfaces whose **directrices** are straight lines as well as the generatrices, ..."**7.** *An Introduction to the Ancient and Modern Geometry of Conics: Being a* by Charles Taylor (1881)

"In the Rectangular Hyperbola the " major" and minor foci and **directrices** are
coincident. In the Circle the minor foci coincide with the centre and the minor ..."