Molecular entities bearing two negative charges, which may be located on a single atom or on different atoms or may be delocalized.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995))
on page 1331
Transformed and rewritten from PDF version (entry
http://www.iupac.org/goldbook/D01674.pdf)
by: Miloslav Nic, Jiri Jirat, Bedrich Kosata, ICT Prague, Czech Republic
