- A chemical compound containing the bivalent group SO4. (noun)
- To treat or react with sulfuric acid or a sulfate. (verb-transitive)
- Electricity To cause lead sulfate to accumulate on (the plates of a lead-acid storage battery). (verb-transitive)
- To become sulfated. (verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.