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sulphonate

noun
  1. a salt or ester of any sulphonic acid containing the ion RSO 2 O or the group RSO 2 O–, R being an organic group
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verb
  1. (tr) to introduce a sulphonic acid group, –SO 2 OH, into (a molecule)
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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