Phthalin

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Phthalin \Phthal"in\, n. (Chem.)
     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.
     [1913 Webster]