Origin of phthalinphthal(ein) + -in
- (chemistry) A colourless crystalline substance obtained by reduction from phthalein, into which it is easily converted by oxidation.
- (chemistry) Any of the series of which phthalin proper is the type.
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.