Thionyl

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Thionyl \Thi"on*yl\, n. [Thionic + -yl.] (Chem.)
     The hypothetical radical {SO}, regarded as an essential
     constituent of certain sulphurous compounds; as, thionyl
     chloride.
     [1913 Webster]