directrix


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di·rec·trix

 (dĭ-rĕk′trĭks, dī-)
n. pl. di·rec·trix·es or di·rec·tri·ces (dī′rĕk-trī′sēz)
1. Mathematics A fixed curve traversed by a generatrix in generating a conic section or a cylinder.
2. The median line in the trajectory of fire of an artillery piece.

directrix

(dɪˈrɛktrɪks; daɪ-)
n
1. (Mathematics) geometry a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity
2. (Professions) a directress
[C17: New Latin, feminine of director]

di•rec•trix

(dɪˈrɛk trɪks, daɪ-)

n., pl. di•rec•trix•es, di•rec•tri•ces (dɪˈrɛk trɪˌsiz, daɪ-, ˌdaɪ rɛkˈtraɪ siz)
1. a fixed line used in the description of a curve or surface.
2. Archaic. directress.
[1695–1705]
usage: See -trix.

di·rec·trix

(dĭ-rĕk′trĭks)
A straight line used in constructing a curve such as a parabola.
References in periodicals archive ?
DirectriX was one of five teams that completed the Challenge.
For generation the directrix trajectories elongated or shortened for a workpiece defined by [z.
Start by plotting all the points that are equidistant from the directrix and from the focus.
Food and Drug Administration, combines the company's DirectriX and Scanhead technologies to reportedly provide improved image quality and dose reduction as well as high throughput and flexibility with a compact design for in-room integration.
DX-S, Agra's new computed radiography (CR) solution, includes two unique technologies: DirectriX needle-based detector and Scanhead line-to-line CR stimulation and light collection.
Let F(0,p) by the focus of y = -p the directrix of the parabola [x.
Consequently, the diffraction cone can be obtained by rotating the directrix about the y axis (matrix [R.
Image sensors for machine vision are selected to enhance directrix detection.
A 21,000-square-foot building on the same property is leased long-term to Directrix.
Cohen currently sits on the board of three other public companies -- Cross Media Marketing (AMEX: XMM); Directrix (OTCBB:DRCX); and Greg Manning Auctions (Nasdaq: GMAI) -- as well as Interlink, a privately held magazine wholesale and distribution company.
The Kinematical Generation of the Directrix Curves of the Geometrical Surfaces.