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hydrogen sulphide

noun
  1. a colourless poisonous soluble flammable gas with an odour of rotten eggs: used as a reagent in chemical analysis. Formula: H 2 SAlso called: sulphuretted hydrogen
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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