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muonium

[myoo-oh-nee-uh m] /myuˈoʊ ni əm/
noun, Physics.
1.
an electron and a positively charged muon bound together by electrical attraction in the same manner as the electron and proton in a hydrogen atom.
Origin of muonium
1955-1960
1955-60; mu(on) + -onium, probably extracted from positronium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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