Search Result for "nucleon": 
Wordnet 3.0

NOUN (1)

1. a constituent (proton or neutron) of an atomic nucleus;


The Collaborative International Dictionary of English v.0.48:

nucleon \nucleon\ n. (Physics) A neutron or proton, when contained within an atomic nucleus. [PJC]
WordNet (r) 3.0 (2006):

nucleon n 1: a constituent (proton or neutron) of an atomic nucleus