pro‧ton /ˈprəʊtɒn $ ˈproʊtɑːn/
noun [countable][
Date: 1800-1900;
Language: Greek;
Origin: 'first thing', from protos; ⇒ proto-]
a very small piece of matter with a positive electrical
charge that is in the central part of an atom ⇒
electron,
neutron [TahlilGaran] Dictionary of Contemporary English ▲