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sodium hydrosulfite

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noun Chemistry.
  1. a white, crystalline, water-soluble powder, Na2S2O4, used as a reducing agent, especially in dyeing, and as a bleach.
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Also called hydrosulfite, so·dium di·thi·o·nite [dahy-thahy-uh-nahyt] /daɪˈθaɪ əˌnaɪt/, sodium hyposulfite.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018