Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of pentathionic is as below...

Pentathionic :: Pentathionic (a.) 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..

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