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 There are 4 words containing SITRO| POSITRON | • positron n. (Physics) The antimatter equivalent of an electron, having the same mass but a positive charge. • POSITRON n. an electron but with a positive charge, also POSITON. |  | POSITRONIUM | • positronium n. (Physics, chemistry) An exotic atom (specifically, an onium) consisting of a positron (anti-electron)… • POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom. |  | POSITRONIUMS | • positroniums n. Plural of positronium. • POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom. |  | POSITRONS | • positrons n. Plural of positron. • POSITRON n. an electron but with a positive charge, also POSITON. |  
 Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America. Definitions are short excerpt from the WikWik.org and 1Word.ws. 
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