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.
A directress.
n.
A directress.
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 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.
Directrix
A directress.
Usage Examples
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