Neutron (noun)

A subatomic particle with no electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Origin:

Coined by james chadwick (1932) from the greek neuter ("neither") + -on.

Examples:

1. Neutrons are important in nuclear physics and nuclear power.
2. The number of neutrons in an atom's nucleus determines its isotope.
3. Neutrons play a key role in the process of nuclear fission.
4. The neutron was discovered in 1932 by James Chadwick.
5. Neutrons have about the same mass as protons, but have no electric charge.