sulfonephthalein

noun
sul·​fone·​phthalein
variants: or less commonly sulfonphthalein \ ¦səlˌfōn , -​fän+ \

Definition of sulfonephthalein

: any of a group of organic compounds (such as phenolsulfonephthalein or bromocresol purple) that are analogous to the phthaleins and like them are intensely colored in alkaline solution and that are made by condensation of phenols with anhydrides or acid chlorides of ortho-sulfobenzoic acid or its derivatives

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!

History and Etymology for sulfonephthalein

sulfone, sulfon- + phthalein

Learn More About sulfonephthalein

Dictionary Entries Near sulfonephthalein

sulfone

sulfonephthalein

sulfonic

See More Nearby Entries 

Statistics for sulfonephthalein

Cite this Entry

“Sulfonephthalein.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sulfonephthalein. Accessed 27 Jan. 2022.

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

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

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