directrix
nounUK /dɪˈɹɛk.tɹɪks/ · CA, US /dɪˈɹɛk.tɹɪks/
Etymology Learned borrowing from Latin dīrēctrīx. By surface analysis, direct + -trix.
1
Feminine Female equivalent of director.
2
Geometry, Mathematics, Sciences 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.
- Derived terms
- conic section directrix, graph directrix, ruled surface directrix