'Pentathionic' definitions:

Definition of 'Pentathionic'

From: GCIDE

Pentathionic \Pen`ta*thi*on"ic\, a. [Penta- + thionic.] (Chem.) Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; -- so called because it contains five atoms of sulphur. [1913 Webster]