noun Chemistry.
a salt of pyrosulfuric acid, as sodium disulfate, Na 2 S 2 O 7 .
Also, disulphate.

1830–40; di-1 + sulfate

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Medical Dictionary

disulfate di·sul·fate (dī-sŭl'fāt')
A compound containing two sulfate ions or radicals.

The American Heritage® Stedman's Medical Dictionary
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