DIRECTRIX
\da͡ɪɹˈɛktɹɪks], \daɪɹˈɛktɹɪks], \d_aɪ_ɹ_ˈɛ_k_t_ɹ_ɪ_k_s]\
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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.
By Oddity Software

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.
By Noah Webster.

A directress; a straight line perpendicular to the axis of a conic section in relation to which its nature may be defined.
By Nuttall, P.Austin.

n. A woman who governs or directs;â€”in geometry, the line or plane along which another line or plane is supposed to move in the generation of a plane or solid figure;â€”a line CD, drawn at right angles to the axis A D, when produced to a distance D from the vertex E, equal to the distance of the vertex E from the focus A.
Word of the day
TMP
 5Thymidylic acid. A thymine nucleotide containing one phosphate group esterified to the deoxyribose moiety.