muonium

[ myoo-oh-nee-uhm ]
/ myuˈoʊ ni əm /

noun Physics.

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.

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Origin of muonium

1955–60; mu(on) + -onium, probably extracted from positronium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020