![nucleon nucleon](https://www.tekportal.net/wp-content/uploads/2018/12/nucleon.jpg)
noun Physics.
- a proton or neutron, especially when considered as a component of a nucleus.
noun
- a proton or neutron, esp one present in an atomic nucleus
n.
- A proton or neutron, especially as part of an atomic nucleus.
- A proton or a neutron, especially as part of an atomic nucleus.