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What is "directrixes"

The Collaborative International Dictionary
Directrixes

Directrix \Di*rect"rix\, n.; pl. E. Directrixes, L. Directrices.

  1. A directress. [R.]
    --Jer. Taylor.

  2. (Geom.)

    1. 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. 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.