**Directrix of a Parabola**

A lineperpendicular to the axis of symmetry used in the definition of a parabola. A parabola is defined as follows: For a given point, called the focus, and a given line not through the focus, called the directrix, a parabola is the locus of points such that the distance to the focus equals the distance to the directrix.

Example: | This is a graph of the parabola with all its major features labeled: axis of symmetry, focus, vertex, and directrix. |

**See also**

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