[ poz-i-troh-nee-uhm ]
/ ˌpɒz ɪˈtroʊ ni əm /
a short-lived atomic system consisting of a positron and an electron bound together.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for positronium
/ (ˌpɒzɪˈtrəʊnɪəm) /
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