# tardyon

> English word · Noun · IPA /ˈtɑː.di.ɒn/

## Definitions
1. Any particle with non-zero mass (i.e. one that travels more slowly than the speed of light).

## Etymology
Blend of tardy + tachyon or tardy + -on.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tardyon