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directrix
(də rek′triks; also dī-)
noun pl. directrixes or directrices
- Rare a woman director
- Geom.
- a fixed line associated with a conic section and its focus and eccentricity
- the curve that bounds the base of a cone or cylinder
See directrix in American Heritage Dictionary 4
noun pl. di·rec·trix·es or di·rec·tri·ces (dīˌrĕk-trīˈsēz)
- Mathematics A fixed curve traversed by a generatrix in generating a conic section or a cylinder.
- The median line in the trajectory of fire of an artillery piece.
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directrix
The directrix at both ends of this general cylinder prints red.
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