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Definitions of Directrix

  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. Webster Dictionary DB
  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. Webster Dictionary DB
  3. A directress; a straight line perpendicular to the axis of a conic section in relation to which its nature may be defined. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
  4. A woman who. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
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