Leptonium
noun ·Rare ·Advanced level
Definitions
- 1 A bound pair of a lepton and its antiparticle particle
"The LHC constraints on exotic stable massive charged particles seem to further shrink the allowed range for the hypercharge down to Y#95;#123;#92;ell#125;#92;approx 8-8.9, with the caveat that the relation between the leptonium mass and the mass of the constituent leptons in our calculations is plagued with a large theoretical uncertainty for large Y#95;#123;#92;ell#125;."
Example
More examples"The LHC constraints on exotic stable massive charged particles seem to further shrink the allowed range for the hypercharge down to Y#95;#123;#92;ell#125;#92;approx 8-8.9, with the caveat that the relation between the leptonium mass and the mass of the constituent leptons in our calculations is plagued with a large theoretical uncertainty for large Y#95;#123;#92;ell#125;."
Etymology
Blend of lepton + onium.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.