n. (pl. -os) any of a group of stable elementary particles with zero electric charge and probably zero mass, which travel at the speed of light.
[ It., dimin. of neutro neutral (as NEUTER) ]
n. (pl. -os) any of a group of stable elementary particles with zero electric charge and probably zero mass, which travel at the speed of light.
[ It., dimin. of neutro neutral (as NEUTER) ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012