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/ˈθeɪliːn/ · noun
(organic chemistry) Any of a range of lactones formed by the reaction of phenols with phthalic anhydride..
Use phthalein when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Phthalein means (organic chemistry) Any of a range of lactones formed by the reaction of phenols with phthalic anhydride..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use phthalein where its definition matches the intended context.
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