| 单词 | positronium |
| 释义 | 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. Origin of positroniumFirst recorded in 1945; positron + -ium; coined by Arthur E. Ruark (1899–1979), U.S. physicist Words nearby positroniumpositive vetting, positivism, positivity, positron, positron emission tomography, positronium, posole, posology, poss., posse, posse comitatus Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for positroniumpositronium / (ˌpɒzɪˈtrəʊnɪəm) / nounphysics 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 positroniumC20: 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 |
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