directrixn.

/dɪˈrɛktrɪks/

Forms: Plural directrices.

Etymology: < medieval or modern Latin dīrectrix, feminine of *dīrector director n.

1. = directress n.

ΘΚΠ

society > authority > control > person in control > [noun] > director > female

directress?1617

directrix1622

directrice1631

1622 H. Sydenham Serm. (1637) ii. 112 As if the same pen had beene as well the directrix of the languages, as the truth.

1656 Disc. Auxiliary Beauty (1662) 31 The Regent and directrix of the whole bodies culture, motion, and welfare.

1678 R. Cudworth True Intellect. Syst. Universe i. iii. 164 The several parts..acting alone..without any common Directrix.

1843 H. Rogers Ess. (1860) III. 40 An unfailing directrix in all difficulties.

1892 J. Rickaby Aquinas Ethicus I. 224 Reason is the directrix of human acts.

2. Geometry †(a) = dirigent n. 3; (see quot. 1753). Obsolete. (b) A fixed line used in describing a curve or surface; spec. the straight line the distance from which of any point on a conic bears a constant ratio to the distance of the same point from the focus.

ΚΠ

1702 J. Raphson Math. Dict. Directrix of the Conchoid.

1702 J. Raphson Math. Dict. App. The two Conchoids, whereof the line CD will be the common Asymptote, which is also called the Directrix.

1753 Chambers's Cycl. Suppl. Directrix, in geometry, the line of motion, along which the describing line, or surface, is carried in the Genesis of any plane or solid figure.

1758 Monthly Rev. 19 403 A certain circle on the same surface, which is, as it were, the conical directrix.

1807 C. Hutton Course Math. (ed. 5) II. 117 If, through the point G, the line GH be drawn perpendicular to the axis, it is called the directrix of the parabola.

1840 D. Lardner Treat. Geom. xx. 269 Lines drawn perpendicular to the transverse axis, through the points D,D', are called directrices of the ellipse.

3. directrix of electrodynamic action (of a given circuit): the magnetic force due to the circuit.

ΚΠ

1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) II. 157 Their resultant is called by Ampère the directrix of the electrodynamic action.

1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) II. 158 We shall henceforth speak of the directrix as the magnetic force due to the circuit.

This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2020).

单词	directrix
释义	directrixn. /dɪˈrɛktrɪks/ Forms: Plural directrices. Etymology: < medieval or modern Latin dīrectrix, feminine of dīrector director n. 1. = directress n. ΘΚΠ society > authority > control > person in control > [noun] > director > female directress?1617 directrix1622 directrice1631 1622 H. Sydenham Serm.* (1637) ii. 112 As if the same pen had beene as well the directrix of the languages, as the truth. 1656 Disc. Auxiliary Beauty (1662) 31 The Regent and directrix of the whole bodies culture, motion, and welfare. 1678 R. Cudworth True Intellect. Syst. Universe i. iii. 164 The several parts..acting alone..without any common Directrix. 1843 H. Rogers Ess. (1860) III. 40 An unfailing directrix in all difficulties. 1892 J. Rickaby Aquinas Ethicus I. 224 Reason is the directrix of human acts. 2. Geometry †(a) = dirigent n. 3; (see quot. 1753). Obsolete. (b) A fixed line used in describing a curve or surface; spec. the straight line the distance from which of any point on a conic bears a constant ratio to the distance of the same point from the focus. ΚΠ 1702 J. Raphson Math. Dict. Directrix of the Conchoid. 1702 J. Raphson Math. Dict. App. The two Conchoids, whereof the line CD will be the common Asymptote, which is also called the Directrix. 1753 Chambers's Cycl. Suppl. Directrix, in geometry, the line of motion, along which the describing line, or surface, is carried in the Genesis of any plane or solid figure. 1758 Monthly Rev. 19 403 A certain circle on the same surface, which is, as it were, the conical directrix. 1807 C. Hutton Course Math. (ed. 5) II. 117 If, through the point G, the line GH be drawn perpendicular to the axis, it is called the directrix of the parabola. 1840 D. Lardner Treat. Geom. xx. 269 Lines drawn perpendicular to the transverse axis, through the points D,D', are called directrices of the ellipse. 3. directrix of electrodynamic action (of a given circuit): the magnetic force due to the circuit. ΚΠ 1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) II. 157 Their resultant is called by Ampère the directrix of the electrodynamic action. 1881 J. C. Maxwell Treat. Electr. & Magnetism (ed. 2) II. 158 We shall henceforth speak of the directrix as the magnetic force due to the circuit. This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2020). < n.1622
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