Look up: directrix

1. Directrix
   Di·rect'rix noun ; plural English Directrixes Latin Directrices 1. A directress. [ R.] Jer. Taylor. 2. (Geom.) (a) A line along which a point in another line moves, or which in any way gover...
   Found on http://www.encyclo.co.uk/webster/D/72
   
   
2. directrix
   1. A directress. ... 2. <geometry> 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. A straight line so situated with...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
3. Directrix
   • (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 directress. • (n.) A straight line so situ...
   Found on http://thinkexist.com/dictionary/meaning
   
   
4. directrix
   (from the article `cone`) ...the surface traced by a moving straight line (the generatrix) that always passes through a fixed point (the vertex). The path, to be definite, is ... ...that is traced by a straight line (the generatrix) that always moves parallel to itself or some fixed line or direction (the axis). The path, to ... ...b...
   Found on http://www.britannica.com/eb/a-z/d/54
   
   
5. Directrix
   In mathematics, a directrix is a line perpendicular to the axis of a conic section, and so placed that the distance from it of any point in the curve is to the distance of the same point from the focus in a constant ratio. The name is also given to any line, whether straight or not, that is required...
   Found on http://www.probertencyclopaedia.com/brow