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neutretto

noun plural -tos physics
  1. the neutrino associated with the muon
  2. (formerly) any of various hypothetical neutral particles
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Word Origin

C20: from neutr (ino) + diminutive suffix -etto
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