radius vectorn.

Brit.

/ˈreɪdɪəs ˌvɛktə/, U.S.

/ˈreɪdiəs ˌvɛktər/

Inflections: Plural radii vectores Brit.

/ˌreɪdɪʌɪ vɛkˈtɔːriːz/, U.S.

/ˌreɪdiaɪ ˌvɛkˈtɔriz/, radius vectors.

Origin: A borrowing from Latin. Etymon: Latin radius vector.

Etymology: < post-classical Latin radius vector (1705 or earlier in an astronomical context; see also note below) < radius radius n. + vector , use as adjective of classical Latin vector vector n. Compare French rayon vecteur (1739 in the passage translated in quot. 1740).In spite of the reference to Johannes Kepler in quot. 1740, Kepler does not appear to use the post-classical Latin term in his writings, e.g. Astronomia nova (1609) (where he first formulated what later became known as Kepler's Second Law) or Harmonice Mundi (1619). In plural form radii vectores after the Latin plural form.

(a) Mathematics. A straight line drawn to a curve from a fixed point and thought of as turning about the fixed point as the point moves along the curve. (b) Astronomy. Such a line joining an orbiting body to its primary. Cf. vector radius at vector n. 1.

ΘΚΠ

the world > relative properties > number > mathematical number or quantity > tensor > [noun] > vector > specific type of

R1675

radius vector1740

spin vector1882

axial vector1903

polar vector1903

free vector1904

position vector1906

four-vector1914

pseudovector1922

row vector1928

1740 J. B. de Freval tr. N. A. Pluche Hist. Heavens II. ii. x. 204 He [sc. Kepler] proportionally determined the increase of the mass of the planets by the lengthening of this radius-vector [Fr. rayon vecteur].

1783 W. Minto Res. Theory Planets vi. 68 By means of the three radii vectores thus found, we shall be able..to determine with tolerable accuracy all the elements of the elliptical orbit of our Planet.

1814 J. Playfair Outl. Nat. Philos. II. i. vi. 103 The line drawn from the moveable to the immoveable body, (the radius vector), describes circles round the latter proportional to the time.

1872 R. A. Proctor Ess. Astron. xxx. 373 These cones will have a common axis—namely, the Earth's radius vector.

1935 A. H. G. Palmer & K. S. Snell Mechanics viii. 166 The area between the path and two radii vectores from the fixed point is h/2 times the time taken to describe that part of the path, where h is a constant.

1991 Notes & Rec. Royal Soc. 45 30 In any central-force field the time of orbit over an arc is proportional to the area swept out by the radius vector that joins the moving body to the force-centre.

This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).

单词	radius vector
释义	radius vectorn. Brit. /ˈreɪdɪəs ˌvɛktə/, U.S. /ˈreɪdiəs ˌvɛktər/ Inflections: Plural radii vectores Brit. /ˌreɪdɪʌɪ vɛkˈtɔːriːz/, U.S. /ˌreɪdiaɪ ˌvɛkˈtɔriz/, radius vectors. Origin: A borrowing from Latin. Etymon: Latin radius vector. Etymology: < post-classical Latin radius vector (1705 or earlier in an astronomical context; see also note below) < radius radius n. + vector , use as adjective of classical Latin vector vector n. Compare French rayon vecteur (1739 in the passage translated in quot. 1740).In spite of the reference to Johannes Kepler in quot. 1740, Kepler does not appear to use the post-classical Latin term in his writings, e.g. Astronomia nova (1609) (where he first formulated what later became known as Kepler's Second Law) or Harmonice Mundi (1619). In plural form radii vectores after the Latin plural form. (a) Mathematics. A straight line drawn to a curve from a fixed point and thought of as turning about the fixed point as the point moves along the curve. (b) Astronomy. Such a line joining an orbiting body to its primary. Cf. vector radius at vector n. 1. ΘΚΠ the world > relative properties > number > mathematical number or quantity > tensor > [noun] > vector > specific type of R1675 radius vector1740 spin vector1882 axial vector1903 polar vector1903 free vector1904 position vector1906 four-vector1914 pseudovector1922 row vector1928 1740 J. B. de Freval tr. N. A. Pluche Hist. Heavens II. ii. x. 204 He [sc. Kepler] proportionally determined the increase of the mass of the planets by the lengthening of this radius-vector [Fr. rayon vecteur]. 1783 W. Minto Res. Theory Planets vi. 68 By means of the three radii vectores thus found, we shall be able..to determine with tolerable accuracy all the elements of the elliptical orbit of our Planet. 1814 J. Playfair Outl. Nat. Philos. II. i. vi. 103 The line drawn from the moveable to the immoveable body, (the radius vector), describes circles round the latter proportional to the time. 1872 R. A. Proctor Ess. Astron. xxx. 373 These cones will have a common axis—namely, the Earth's radius vector. 1935 A. H. G. Palmer & K. S. Snell Mechanics viii. 166 The area between the path and two radii vectores from the fixed point is h/2 times the time taken to describe that part of the path, where h is a constant. 1991 Notes & Rec. Royal Soc. 45 30 In any central-force field the time of orbit over an arc is proportional to the area swept out by the radius vector that joins the moving body to the force-centre. This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022). < n.1740
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