thionic acid
noun
thi·on·ic acid
thī-ˌän-ik- 
: any of a series of unstable acids of the general formula H2SnO6 in which the number of atoms of sulfur in the molecule varies from 2 to 6
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“Thionic acid.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/thionic%20acid. Accessed 1 Dec. 2025.
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