Webster's English Dictionary

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sulfate

1. sul.fate \'s*l-.fa-t\ n [F, fr. L sulfur] : a salt or ester of sulfuric 
   acid 
2. sulfate vt 1: to treat or combine with sulfuric acid, a sulfate, or a 
   related agent;  also : to convert into a sulfate 2: to form a deposit of a 
   whitish scale of lead sulfate on (the plates of  a storage battery) : to 
   become sulfated