- Pentathionic
- 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]
The Collaborative International Dictionary of English. 2000.