IPA: /ˈsʌlfərəs/
KK: /ˈsʌlfərəs/
Relating to or containing sulfur, often associated with a strong, unpleasant smell.
The sulphurous fumes from the volcano could be smelled miles away.
Sulphurous → It is formed from "sulphur" (from Latin *sulphur*, meaning brimstone or sulfur) and "-ous" (meaning full of or having the qualities of). The word "sulphurous" means having the qualities of sulfur, often associated with a strong, unpleasant smell.
Think of 'sulphur' as the source of a strong smell, and remember that 'sulphurous' describes something that is full of that sulfur-like quality.