Definitions of directrix
n. - A directress. 2
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. 2
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. 2
The word "directrix" uses 9 letters: C D E I I R R T X.
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