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Directrix   Listen
noun
Directrix  n.  (pl. E. directrixes, L. directrices)  
1.
A directress. (R.)
2.
(Geom.)
(a)
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.
(b)
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.






Collaborative International Dictionary of English 0.48







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