(definition) by Webster 1913 Wed Dec 22 1999 at 3:57:00

Tri`thi*on"ic (?), a. [Pref. tri- + thionic.] Chem.

Of or pertaining to, or designating, a certain thionic acid, H2S3O6 which is obtained as a colorless, odorless liquid.

 

© Webster 1913.

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