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Noun: thiol  'thI,ówl
  1. Any one of series of compounds, hydrosulphides of alcohol radicals, in composition resembling the alcohols, but containing sulphur in place of oxygen, and hence called also the sulphur alcohols. In general, they are colourless liquids having a strong, repulsive, garlic odour
    - mercaptan

Derived forms: thiols

Encyclopedia: Thiol