Bible Dictionaries
Phthalin
Webster's Dictionary
(n.) A colorless crystalline substance obtained by reduction from phthalein, into which it is easily converted by oxidation; hence, any one of the series of which phthalin proper is the type.
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Bibliography Information
Webster, Noah. Entry for 'Phthalin'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/phthalin.html. 1828.