proton
Concise Oxford English Dictionary © 2008 Oxford University Press:
proton /ˈprəʊtɒn/
▶noun Physics a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.
– derivatives
protonic adjective.
protonic adjective.
– origin 1920s: from Gk, neut. of prōtos ‘first’.
'proton' also found in these Oxford entries:
