- (n.) A line along which a point in another line moves or which in any way governs the motion of the point and determines the position of the curve generated by it; the line along which the generatrix moves in generating a surface.
- (n.) A directress.
- (n.) A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio to the distance of the same point from the focus.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). directrix. Retrieved September 21, 2026, from http://smartdefine.org/directrix/definitions/1997973 |
| Chicago | Webster's. 2011. "directrix" http://smartdefine.org/directrix/definitions/1997973 (accessed September 21, 2026). |
| Harvard | Webster's 2011, directrix, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/directrix/definitions/1997973>. |
| MLA | Webster's. "directrix" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/directrix/definitions/1997973> |