directrix

About 0.04 uses per million words.

Meaning

1. noun Female equivalent of director.
2. noun 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.

Similar words

directrice directoress driveress dictatoress dominatrix draperess doctrix dockmistress dentistress duct

Often followed by

of is and in property y at to line

Word family

directrices directrixes