anion

1. A negatively charged ion (synset 109220693)
   is a type of: ion - a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons
   subtypes:

   • hydroxide ion, hydroxyl ion - the anion OH having one oxygen and one hydrogen atom
   • superoxide, superoxide anion - the univalent anion O2-

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