ammonium persulfate


Definition of ammonium persulfate

: a colorless crystalline salt (NH4)2S2O8 used as an oxidizing agent and for improving dense photographic negatives

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of ammonium persulfate

1891, in the meaning defined above

Keep scrolling for more

Learn More About ammonium persulfate

Time Traveler for ammonium persulfate

Time Traveler

The first known use of ammonium persulfate was in 1891

See more words from the same year

Dictionary Entries Near ammonium persulfate

ammonium perchlorate

ammonium persulfate

ammonium phosphate

See More Nearby Entries 

Statistics for ammonium persulfate

Cite this Entry

“Ammonium persulfate.” Dictionary, Merriam-Webster, Accessed 22 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Name That Food

  • a-light
  • Name these cookies!
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!