A chemical compound containing two sulfate groups or two atoms of sulfur in combination with oxygen.
From di- (two) + sulfate (from sulfur + -ate, a suffix indicating chemical compounds or salts). Systematic chemical nomenclature combining Greek numerals with compound names.
Chemical nomenclature like 'disulfate' is deliberately boring and precise—imagine if chemists used creative names like they did in medieval alchemy ('vitriol' for sulfuric acid); science would be incomprehensible.
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