directrix


di·rec·trix

noun \-ˈrek-triks\
plural di·rec·trix·es\-trik-səz\ also di·rec·tri·ces\-trə-ˌsēz\

Definition of DIRECTRIX

1
archaic :  directress
2
:  a fixed curve with which a generatrix maintains a given relationship in generating a geometric figure; specifically :  a straight line the distance to which from any point of a conic section is in fixed ratio to the distance from the same point to a focus

Origin of DIRECTRIX

Medieval Latin, feminine of Late Latin director, from Latin dirigere
First Known Use: 1622

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