Definition of directrix in English:

directrix

nounPlural directrices dʌɪˈrɛktrɪksdɪˈrɛktrɪksdəˈrɛktrɪks

Geometry

A fixed line used in describing a curve or surface.
〔几何〕准线
Example sentencesExamples
- In the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A ’, B ’, etc.
- It is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix.
- The directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse.
- The hyperboloid is then indented and connected to a series of hyperbolic paraboloids through their common directrices, thereby leading the ensemble toward the four load-bearing points to the ground.
- The focus and directrix of a hyperbola were considered by Pappus.

Origin

Early 18th century: from medieval Latin, literally 'directress', based on Latin dirigere 'to guide'.

Definition of directrix in US English:

directrix

noundəˈrɛktrɪksdəˈrektriks

Geometry

A fixed line used in describing a curve or surface.
〔几何〕准线
Example sentencesExamples
- The directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse.
- It is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix.
- The hyperboloid is then indented and connected to a series of hyperbolic paraboloids through their common directrices, thereby leading the ensemble toward the four load-bearing points to the ground.
- In the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A ’, B ’, etc.
- The focus and directrix of a hyperbola were considered by Pappus.

Origin

Early 18th century: from medieval Latin, literally ‘directress’, based on Latin dirigere ‘to guide’.

单词	directrix
释义	Definition of directrix in English: directrix nounPlural directrices dʌɪˈrɛktrɪksdɪˈrɛktrɪksdəˈrɛktrɪks Geometry A fixed line used in describing a curve or surface. 〔几何〕准线 Example sentencesExamples In the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A ’, B ’, etc. It is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix. The directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse. The hyperboloid is then indented and connected to a series of hyperbolic paraboloids through their common directrices, thereby leading the ensemble toward the four load-bearing points to the ground. The focus and directrix of a hyperbola were considered by Pappus. Origin Early 18th century: from medieval Latin, literally 'directress', based on Latin dirigere 'to guide'. Definition of directrix in US English: directrix noundəˈrɛktrɪksdəˈrektriks Geometry A fixed line used in describing a curve or surface. 〔几何〕准线 Example sentencesExamples The directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse. It is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix. The hyperboloid is then indented and connected to a series of hyperbolic paraboloids through their common directrices, thereby leading the ensemble toward the four load-bearing points to the ground. In the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A ’, B ’, etc. The focus and directrix of a hyperbola were considered by Pappus. Origin Early 18th century: from medieval Latin, literally ‘directress’, based on Latin dirigere ‘to guide’.
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