D defs.my
Entry 2 senses Webster, 1913

Sulphurous

· Sul·phur·ous · IPA
01 a. Of or pertaining to sulphur.
  1. 1.
    Of or pertaining to sulphur.
  2. 2.
    Derived from, or containing, sulphur; specifically, designating those compounds in which the element has a lower valence as contrasted with the sulphuric compounds.(Chem.)
Phrases & compounds
Sulphurous acid — Sulphur dioxide. See under Sulphur.
Sulphurous anhydride — sulphur dioxide. See under Sulphur.