Pentathionic
Pronunciation : Pen`ta*thi*on"ic
Part of Speech : a.
Etymology : [Penta- + thionic.] (Chem.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913