tardyonn.

Brit.

/ˈtɑːdɪɒn/, U.S.

/ˈtɑrdiˌɑn/

Forms: 1900s– tardon, 1900s– tardyon.

Origin: Formed within English, by derivation. Etymons: tardy adj., -on suffix¹.

Etymology: < tardy adj. (and adv.) + -on suffix¹, punningly after tachyon n.

Physics.

A subatomic particle which travels at less than the speed of light, as contrasted with the hypothetical tachyon.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > [noun] > a particle > travelling below speed of light

tardyon1969

1969 O.-M. Bilaniuk & E. C. G. Sudarshan in Physics Today May 47/2 Let us refer to all subluminal particles as tardyons.

1972 Nature 7 Jan. 10/3 This assumes that ‘ordinary’ particles (called tardyons in this sort of discussion) have a mass m such that m² is greater than zero.

1975 J. Taylor Superminds (1976) vi. 114 Tardons (slower-than-light particles) and tachyons can never interchange roles.

2009 D. Broderick Quipu 179 Three general categories of particles in the universe: ‘tardyons’ or ‘tardons’ or ‘bradyons’, depending on which college you went to,..; ‘luxons’ which are massless and whip along at the speed of light; and ‘tachyons’ which never go slower than light.

This entry has been updated (OED Third Edition, December 2013; most recently modified version published online March 2022).

单词	tardyon
释义	tardyonn. Brit. /ˈtɑːdɪɒn/, U.S. /ˈtɑrdiˌɑn/ Forms: 1900s– tardon, 1900s– tardyon. Origin: Formed within English, by derivation. Etymons: tardy adj., -on suffix¹. Etymology: < tardy adj. (and adv.) + -on suffix¹, punningly after tachyon n. Physics. A subatomic particle which travels at less than the speed of light, as contrasted with the hypothetical tachyon. ΘΚΠ the world > matter > physics > atomic physics > particle physics > [noun] > a particle > travelling below speed of light tardyon1969 1969 O.-M. Bilaniuk & E. C. G. Sudarshan in Physics Today May 47/2 Let us refer to all subluminal particles as tardyons. 1972 Nature 7 Jan. 10/3 This assumes that ‘ordinary’ particles (called tardyons in this sort of discussion) have a mass m such that m² is greater than zero. 1975 J. Taylor Superminds (1976) vi. 114 Tardons (slower-than-light particles) and tachyons can never interchange roles. 2009 D. Broderick Quipu 179 Three general categories of particles in the universe: ‘tardyons’ or ‘tardons’ or ‘bradyons’, depending on which college you went to,..; ‘luxons’ which are massless and whip along at the speed of light; and ‘tachyons’ which never go slower than light. This entry has been updated (OED Third Edition, December 2013; most recently modified version published online March 2022). < n.1969
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