Main Entry:

di·rec·trix

Pronunciation:

\-ˈrek-triks\

Function:

noun

Inflected Form(s):

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

Etymology:

Medieval Latin, feminine of Late Latin director, from Latin dirigere

Date:

1622

1archaic : directress2: 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