I. ˈsəl-ˌfāt noun
Etymology: French, from Latin sulfur
Date: 1788
1. : a salt or ester of sulfuric acid
2. : a divalent group or anion SO 4 characteristic of sulfuric acid and the sulfates
II. transitive verb
( sul·fat·ed ; sul·fat·ing )
Date: 1888
: to treat or combine with sulfuric acid or a sulfate