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sulphurous acid

noun
  1. an unstable acid produced when sulphur dioxide dissolves in water: used as a preservative for food and a bleaching agent. Formula: H 2 SO 3Systematic name: sulphuric(IV) acid
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for sulphurous acid

Historical Examples

  • Though commingled with sulphurous-acid gas, it still had the characteristic smell of steam.

    Outlines of the Earth's History

    Nathaniel Southgate Shaler