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Origin and history of sulfurous
sulfurous(adj.)
1520s, "containing, impregnated with, or resembling sulfur; of the nature of brimstone," from Latin sulphurosus "full of sulfur," or a native formation from sulfur + -ous. The spelling sulphurous is standard in Britain.
Hence figurative use with suggestions of hellfire (c. 1600). The scientific chemistry sense is from 1790. The spelling with -ph- is standard in Britain.
Middle English had sulfury "containing or impregnated with sulfur" (early 15c.). Earlier in the "brimstone-like" sense was sulphureose (early 15c.), and Old English had sweflen. Related: Sulfurously; sulphurously; sulfurousness.
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