Usually means: Negatively charged ion with two electrons.
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We found 4 dictionaries that define the word dianion:

General (2 matching dictionaries)
  1. dianion: Wiktionary
  2. Dianion: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Dianion: Encyclopedia

Medicine (1 matching dictionary)
  1. Dianion: Medical dictionary

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Definitions from Wiktionary (dianion)

▸ noun:  (chemistry) Any anion carrying two negative charges

Similar:
diion, monoanion, polyanion, monoion, trianion, dication, counteranion, counterion, dicyanide, dipolar ion, more...

Opposite:
cation, positive ion

Phrases:
Diethynylbenzene dianion, more...

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Similar:
diion, monoanion, polyanion, monoion, trianion, dication, counteranion, counterion, dicyanide, dipolar ion, more...

Opposite:
cation, positive ion

Phrases:
Diethynylbenzene dianion, more...



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