positronium
noun
pos·i·tro·ni·um
ˌpä-zə-ˈtrō-nē-əm 
: a short-lived system that consists of a positron and an electron bound together and is suggestive of a hydrogen atom
Examples of positronium in a Sentence
Recent Examples on the Web
For example, in the 1990s physicists thought, essentially, that positronium didn’t live as long as predicted.
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Adrian Cho, Science | AAAS, 25 Aug. 2020
That makes positronium an ideal tool with which to look for new physics, Cassidy says.
—Adrian Cho, Science | AAAS, 25 Aug. 2020
Adrian Cho, Science | AAAS, 25 Aug. 2020
That makes positronium an ideal tool with which to look for new physics, Cassidy says.
—Adrian Cho, Science | AAAS, 25 Aug. 2020
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'positronium.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1945, in the meaning defined above
Dictionary Entries Near positronium
Cite this Entry
“Positronium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/positronium. Accessed 6 Dec. 2023.
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Britannica.com: Encyclopedia article about positronium
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