First Known Use: 1622
Dictionary
directrix
noun di·rec·trix \-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
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Origin of DIRECTRIX
Medieval Latin, feminine of Late Latin director, from Latin dirigere
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