neutrino
Concise Oxford English Dictionary © 2008 Oxford University Press:
neutrino /njuːˈtriːnəʊ/
▶noun (pl. neutrinos) a neutral subatomic particle with a mass close to zero, rarely interacting with normal matter.
– origin 1930s: from Ital., dimin. of neutro ‘neutral’.
'neutrino' also found in these Oxford entries:

