Directrix

In mathematics, a directrix is a curve associated with a process generating a geometric object, such as:

• Directrix (conic section)
  • Directrix (ellipse)
• Directrix (generatrix)
• Directrix (rational normal scroll)

Other uses

• Directrix is a spaceship in the Lensman series of novels by E. E. Smith.
• Directrix is the name of an indie alternative band in Chicago.
• Directrix - a feminine form of director in the context of grammatical gender.