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phthalin

[thal-in, fthal-] /ˈθæl ɪn, ˈfθæl-/
noun, Chemistry
1.
any of a group of compounds obtained by the reduction of the phthaleins.
Origin
1870-1875
1870-75; (na)phthal(ene) + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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