hyposulfurous acid

/HH AY1 P OW1 S AH1 L F ER0 AH0 S AE0 S AH0 D/
noun
  1. 1

    (inorganic chemistry) An unstable acid, H₂S₂O₂, only known in solution, used as a reducing agent; its salts are hyposulfites).

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