nucleon

noun

a proton or neutron

Wiktionary

Pronunciation: /ˈn(j)uːkliɒn/

noun

Etymology: Etymology tree Proto-Italic *knuks Latin nux Latin nucleuslbor. English nucleus Proto-Indo-European *kerh₃-der.? Latin carbōlbor. French carbonebor. English carbonbf. English -on English nucleon From nucleus + -on.

A proton (uud) or a neutron (udd).