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positronium

[poz-i-troh-nee-uh m]
noun Physics.
  1. a short-lived atomic system consisting of a positron and an electron bound together.
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Origin of positronium

1945; positron + -ium, coined by A. E. Ruark (born 1899), U.S. physicist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for positronium

positronium

noun
  1. physics a short-lived entity consisting of a positron and an electron bound together. It decays by annihilation to produce two or three photons
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Word Origin

C20: from positron + -ium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012