Etymology
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sulfate (n.)

salt of sulfuric acid, 1790 (sulphat), from French sulphate (1787), from Modern Latin sulphatum acidum, from Latin sulpur, sulphur (see sulfur) + chemical ending -ate (3). The spelling with -ph- is standard in Britain.

updated on December 28, 2013

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Definitions of sulfate from WordNet
1
sulfate (v.)
convert into a sulfate;
2
sulfate (n.)
a salt or ester of sulphuric acid;
Synonyms: sulphate
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.