Use 'sulphurous' to describe the distinct smell or taste often associated with sulfur. The sulphurous fumes emanating from the factory indicated a chemical process at work.
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Scientific Context
In scientific contexts, 'sulphurous' refers to substances or reactions involving sulfur. Sulphurous gas emissions from the volcano pose a health risk.
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Chemical Specificity
'Sulphurous' may indicate a specific valence state of sulfur in chemistry. Sulphurous acid is less oxidizing than sulfuric acid.