Trithionic
Pronunciation : Tri`thi*on"ic
Part of Speech : a.
Etymology : [Pref. tri- + thionic.] (Chem.)
Definition : Defn: Of or pertaining to, or designating, a certain thionic acid, H2S3O6 which is obtained as a colorless, odorless liquid.
Source : Webster's Unabridged Dictionary, 1913