preon
/ˈpriːɒn/ /ˈpriːən/Particle Physics
noun
A hypothetical particle postulated as a constituent of quarks and leptons.
- Prequark was a slightly earlier name, but has been more or less superseded by preon..
Origin
1970s; earliest use found in Nigel Calder (b. 1931). From pre- + -on.
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