noun Chemistry.
a salt of sulfuric acid, containing the HSO 4 group; an acid sulfate; a hydrogen sulfate, as sodium bisulfate, NaHSO 4 .
Also, bisulphate.

1860–65; bi-1 + sulfate Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bisulphate (baɪˈsʌlˌfeɪt)
1.  a salt or ester of sulphuric acid containing the monovalent group -HSO4 or the ion HSO4--
2.  (modifier) consisting of, containing, or concerned with the group -HSO4 or the ion HSO4--: bisulphate ion

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American Heritage
Medical Dictionary

bisulfate bi·sul·fate (bī-sŭl'fāt')

  1. The univalent inorganic acid group HSO4.

  2. A salt of sulfuric acid containing this group. Also called acid sulfate.

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