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positronium

[ poz-i-troh-nee-uhm ]
/ ˌpɒz ɪˈtroʊ ni əm /

noun Physics.

a short-lived atomic system consisting of a positron and an electron bound together.

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Origin of positronium

First recorded in 1945; positron + -ium; coined by Arthur E. Ruark (1899–1979), U.S. physicist

Words nearby positronium

positive vetting, positivism, positivity, positron, positron emission tomography, positronium, posole, posology, poss., posse, posse comitatus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for positronium

positronium
/ (ˌpɒzɪˈtrəʊnɪəm) /

noun

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

Word Origin for positronium

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