neutron [i nJ0:trZn | nj0:trCn ]     (순위: 15870 - 대졸 수준)   뜻  명) [물리] 중성자 Mean  An electrically neutral subatomic particle in the baryon family, having a mass 1,839 times that of the electron, stable when bound in an atomic nucleus, and having a mean lifetime of approximately 1.0 X 10^3 seconds as a free particle.