Definition of ion noun from the Oxford Advanced Learner's Dictionary

 

ion

 noun
noun
BrE BrE//ˈaɪən//
 
; NAmE NAmE//ˈaɪən//
 
; BrE also BrE//ˈaɪɒn//
 
; NAmE also NAmE//ˈaɪɑːn//
 
(physics or chemistry) Molecules and matter
 
jump to other results
an atom or a molecule with a positive or negative electric charge caused by its losing or gaining one or more electrons Wordfinderantiparticle, atom, electron, ion, neutron, nucleus, particle, positron, proton, valency See related entries: Molecules and matter Word Origin mid 19th cent.: from Greek, neuter present participle of ienai ‘go’.
See the Oxford Advanced American Dictionary entry: ion

Other results

All matches