Chemistry. a salt or ester of sulfuric acid.
verb (used with object), sulfated, sulfating.
to combine, treat, or impregnate with sulfuric acid, a sulfate, or sulfates.
to convert into a sulfate.
Electricity. to form a deposit of lead-sulfate compound on (the lead electrodes of a storage battery).
verb (used without object), sulfated, sulfating.
to become sulfated.

1780–90; < Neo-Latin sulphātum. See sulfur, -ate2

sulfation, noun
supersulfate, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1790 (sulphat), from Fr. sulphate (1787), from Mod.L. sulphatum acidum, from L. sulpur, sulphur (see sulfur) + chemical ending -ate. The spelling with -ph- is standard in Britain.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sulfate sul·fate (sŭl'fāt')

  1. A salt or an ester of sulfuric acid.

  2. The bivalent group SO4.

  3. A chemical compound containing such a group.

v. sul·fat·ed, sul·fat·ing, sul·fates
  1. To treat or react with sulfuric acid or a sulfate.

  2. To become sulfated.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
sulfate   (sŭl'fāt')  Pronunciation Key 
A salt or ester of sulfuric acid, containing the group SO4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Apply aluminum sulfate, which is often packaged expressly for hydrangeas,
  following label directions.
The yellow substance was gypsum, or calcium sulfate dehydrate, a common
  component of plaster.
He knew that microorganisms could live in oxygen-deprived environments by
  processing things such as sulfate and methane.
With the greenish, crystalline look of a pulverized windshield, ferrous sulfate
  is commonly given to iron-deficient humans.
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