1. 
   muonium
   short-lived quasi-atom composed of a positive muon (an antiparticle), as nucleus, and an ordinary negative electron. It is formed when a positive ... [1 related articles]
   Found op http://www.britannica.com/eb/a-z/m/139
   
   
2. 
   Muonium
   Muonium is an exotic atom made up of an antimuon and an electron, which was discovered in 1960 and is given the chemical symbol {Element|Muonium}. During the muon`s {val|2.2|u=µs} lifetime, muonium can enter into compounds such as muonium chloride ({Element|Muonium}{Element|Chlorine}) or sodium mu...
   Found op http://en.wikipedia.org/wiki/Muonium
   
   
3. 
   muonium
   A short-lived entity formed by a muon and its antiparticle attracted together and revolving about a common center.
   Found op http://www.daviddarling.info/encyclopedia/M/muonium.html
   
   

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