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phthalin

[thal-in, fthal-]
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noun Chemistry.
  1. any of a group of compounds obtained by the reduction of the phthaleins.
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Origin of phthalin

First recorded in 1870–75; (na)phthal(ene) + -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018