directrix (plural directrixes or directrices)
A female who directs; a directress.
(geometry) 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.
• creditrix
Source: Wiktionary
Di*rect"rix, n.; pl. E. Directrixes (, L. Directrices (.
1. A directress. [R.] Jer. Taylor.
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.
Source: Webster’s Unabridged Dictionary 1913 Edition
21 November 2024
(noun) a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast
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