Oxford Dictionary English proton noun noun BrE BrE//ˈprəʊtɒn// ; NAmE NAmE//ˈproʊtɑːn// (physics) Molecules and matter Add to my wordlistjump to other results a very small piece of matter (= a substance) with a positive electric charge that forms part of the nucleus (= central part) of an atom see also electron, neutron Wordfinderatomantiparticle, atom, electron, ion, neutron, nucleus, particle, positron, proton, valency See related entries: Molecules and matter Word Origin1920s: from Greek, neuter of prōtos ‘first’.See proton in the Oxford Learner's Dictionary of Academic EnglishSee proton in the Oxford Advanced American DictionaryCheck pronunciation: proton oxfordlearnersdictionaries.com
