A chemical salt containing two sulfate groups or two atoms of sulfur combined with oxygen.
British spelling variant using dis- (two) + sulphate, where sulphate comes from sulfur + -ate (indicating a salt of an acid), following nomenclature rules for compounds with multiple sulfur-oxygen groups.
The British spelling 'sulph-' versus American 'sulf-' creates a whole parallel vocabulary in chemistry—you might find 'disulphate' in 100-year-old British chemistry texts while Americans were writing 'disulfate' simultaneously.
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