hydrosulfurous acid

hy·​dro·​sulfurous acid | \ "+...- \

Definition of hydrosulfurous acid

: an unstable acid H2S2O4 known only in aqueous solution formed by reducing sulfurous acid or in the form of salts not used scientifically

called also dithionous acid, hyposulfurous acid

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for hydrosulfurous acid

hydrosulfurous International Scientific Vocabulary hydr- + sulfurous

Keep scrolling for more

Learn More about hydrosulfurous acid

Statistics for hydrosulfurous acid

Cite this Entry

“Hydrosulfurous acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrosulfurous%20acid. Accessed 29 Sep. 2020.

Comments on hydrosulfurous acid

What made you want to look up hydrosulfurous acid? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!