pseudo-rayn.

Brit.

/ˈs(j)uːdə(ʊ)reɪ/, U.S.

/ˈsudoʊˌreɪ/

Origin: Formed within English, by compounding. Etymons: pseudo- comb. form, ray n.⁵

Etymology: < pseudo- comb. form + ray n.⁵

†1. Geometry. A geodesic in a non-Euclidean space or a space of more than three dimensions analogous to a ray or straight line in two- or three-dimensional Euclidean space. Obsolete. rare.Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Pseudo-ray, a straight line or ray in non-Euclidean geometry.

2. Optics. A ray with abnormal properties that arises in the course of certain calculations; spec. one that does not obey Snell's law of refraction.

ΚΠ

1963 Proc. Royal Soc. A. 276 371 (caption) For X on the concave (dark) side ZY₀X gives a pseudo ray corresponding to the travel time of a diffused pulse.

1985 K. G. Budden Propagation Radio Waves xiv. 422 These rays cannot obey Snell's law..because n is complex. They will therefore be called ‘pseudo rays’.

1998 Optics & Lasers Engin. 29 325 We justify the expediency of the employment of pseudo-rays in the course of designing optical systems including radially-gradient and diffractive lenses.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	pseudo-ray
释义	pseudo-rayn. Brit. /ˈs(j)uːdə(ʊ)reɪ/, U.S. /ˈsudoʊˌreɪ/ Origin: Formed within English, by compounding. Etymons: pseudo- comb. form, ray n.⁵ Etymology: < pseudo- comb. form + ray n.⁵ †1. Geometry. A geodesic in a non-Euclidean space or a space of more than three dimensions analogous to a ray or straight line in two- or three-dimensional Euclidean space. Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Pseudo-ray, a straight line or ray in non-Euclidean geometry. 2. Optics. A ray with abnormal properties that arises in the course of certain calculations; spec. one that does not obey Snell's law of refraction. ΚΠ 1963 Proc. Royal Soc. A. 276 371 (caption) For X on the concave (dark) side ZY₀X gives a pseudo ray corresponding to the travel time of a diffused pulse. 1985 K. G. Budden Propagation Radio Waves xiv. 422 These rays cannot obey Snell's law..because n is complex. They will therefore be called ‘pseudo rays’. 1998 Optics & Lasers Engin. 29 325 We justify the expediency of the employment of pseudo-rays in the course of designing optical systems including radially-gradient and diffractive lenses. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1890
随便看	to lay aback to lay aboard to lay about to lay about one to lay abroad to lay adown to lay all in the dirt to lay all one's irons in the fire to lay along to lay an ambush to lay an egg to lay an eyeball on to lay an information to lay any one on his back to lay apart to lay aside to lay aside the tomahawk to lay asunning to lay at to lay at anchor to lay at or to door to lay at or to his door to lay athwart the hawse to lay away to lay back