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We found 13 dictionaries with English definitions that include the word positronium: Click on the first link on a line below to go directly to a page where "positronium" is defined. General (10 matching dictionaries) positronium: American Heritage Dictionary of the English Language [home, info] positronium: Collins English Dictionary [home, info] positronium: Merriam-Webster's Online Dictionary, 11th Edition [home, info] positronium: Wiktionary [home, info] positronium: Webster's New World College Dictionary, 4th Ed. [home, info] positronium: The Wordsmyth English Dictionary-Thesaurus [home, info] positronium: Infoplease Dictionary [home, info] positronium: Dictionary.com [home, info] Positronium: Wikipedia, the Free Encyclopedia [home, info] positronium: Dictionary/thesaurus [home, info] Computing (1 matching dictionary) positronium: Encyclopedia [home, info] Science (2 matching dictionaries) Positronium: Eric Weisstein's World of Physics [home, info] Positronium: Extragalactic Astronomy [home, info]