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Definition 2024

tardyon ‎(plural tardyons)

(physics) Any particle with non-zero mass (i.e. one that travels more slowly than the speed of light).
- 1972, Isaac Asimov, Asimov's Guide to Science
  One, our own, is the tardyon-universe, in which all particles go at subluminal velocities and may accelerate to nearly the speed of light.
- 1988, Nick Herbert, Faster Than Light: Superluminal Loopholes in Physics
  Just as brute force cannot make a tachyon out of a tardyon...