phthalin

noun

phthal·​in

ˈthalə̇n

plural -s

: any of a group of colorless compounds obtained by reduction of the phthaleins into which they are easily reconverted by oxidation

especially : the compound C₂₀H₁₆O₄ from phenolphthalein

Word History

Etymology

International Scientific Vocabulary phthal- + -in

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!