Etymology

directrix

di·rec·trix
D2I1R1E1C3T1R1I1X8

Today it means: 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. Full definition →

Latin dīrēctrīx
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The story

  1. Latin · learned borrowing fromdīrēctrīx
  2. Latin · learned borrowing fromdīrēctrīx
  3. English todaydirectrix

Learned borrowing from Latin dīrēctrīx. By surface analysis, direct + -trix.

Etymology from Wiktionary, CC BY-SA 4.0.