Directrix Definition

dĭ-rĕktrĭks, dī-
directrices, directrix
noun
A woman director.
Webster's New World
A fixed line associated with a conic section and its focus and eccentricity.
Webster's New World
The median line in the trajectory of fire of an artillery piece.
American Heritage
The curve that bounds the base of a cone or cylinder.
Webster's New World
Wiktionary

Other Word Forms of Directrix

Noun

Singular:
directrix
Plural:
directrices

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