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[myoo-oh-nee-uh m]
See more synonyms for muonium on Thesaurus.com
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.
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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. 2018