Found 1 items, similar to Directrix.
English → English (gcide) Definition: Directrix Directrix \Di*rect"rix\, n.; pl. E. Directrixes, L. Directrices. 1. A directress. [R.] --Jer. Taylor. [1913 Webster] 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. [1913 Webster]