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Di*rect"rix (?), n.; pl. E.
Directrixes (&?;), L. Directrices (&?;).
1. A directress. [R.] Jer.
2. (Geom.) (a) A line
along which a point in another line moves, or which in any way
governs the motion of the point and determines the position of the
curve generated by it; the line along which the generatrix moves in
generating a surface. (b) A straight line
so situated with respect to a conic section that the distance of any
point of the curve from it has a constant ratio to the distance of
the same point from the focus.
- Webster's Unabridged Dictionary (1913)
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The correct spelling of this word ought to be: Directrix
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