pos·i·tro·ni·um
| \ ˌpä-zə-ˈtrō-nē-əm
\
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Definition of positronium
: a short-lived system that consists of a positron and an electron bound together and is suggestive of a hydrogen atom
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“Positronium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/positronium. Accessed 30 Jun. 2022.
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Time Traveler for positronium
The first known use of positronium was in 1945
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