Directrix meaning

dĭ-rĕktrĭks, dī-
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(mathematics) A fixed curve traversed by a generatrix in generating a conic section or a cylinder.
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The median line in the trajectory of fire of an artillery piece.
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(rare) A woman director.
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A straight line used in generating a curve such as a parabola.
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(geometry) A line used to define a curve or surface; especially a line, the distance from which a point on a conic has a constant ratio to that from the focus.
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