Sulphuryl \Sul"phur*yl\, n. [Sulphur + -yl.] (Chem.)
   The hypothetical radical SO2; -- called also sulphon.
   [1913 Webster]

   Sulphuryl chloride, a chloride, pungent, fuming liquid,
      SO2.Cl2, obtained by the action of phosphorus
      pentachloride on sulphur trioxide. On treatment with water
      it decomposes into sulphuric and hydrochloric acids, and
      is hence called also sulphuric chloranhydride.
      [1913 Webster]