selenious acid
noun
se·le·ni·ous acid
sə-ˌlē-nē-əs- 
: a poisonous hygroscopic crystalline acid H2SeO3 that is a weaker acid than sulfurous acid and is an oxidizing agent yielding selenium as it is reduced
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“Selenious acid.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/selenious%20acid. Accessed 31 Oct. 2025.
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