tardyonn.
/ˈtɑːdɪɒn/, U.S. /ˈtɑrdiˌɑn/ Physics.
A subatomic particle which travels at less than the speed of light, as contrasted with the hypothetical tachyon.
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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).
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n.1969