Definitions of Directrix

  1. A directress. Webster Dictionary DB
  2. 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
  3. 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
  4. 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.
  5. A woman who. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
  6. (pl. -ices). =DIRECTRESS; (Geom.) fixed line used in describing curve or surface. Concise Oxford Dictionary
  7. Directrix In Solid Geom., when a surface is described by a moving line which slides on one or more fixed guiding lines, any one of the fixed lines is called a Directrix. Glossary of terms and phrases - Percy
  8. See Conic sections. Glossary of terms and phrases - Percy
  9. n. A woman who governs or directs;—in geometry, the line or plane along which another line or plane is supposed to move in the generation of a plane or solid figure;—a line CD, drawn at right angles to the axis A D, when produced to a distance D from the vertex E, equal to the distance of the vertex E from the focus A. Cabinet Dictionary