sulfurous

adjective

sul·​fu·​rous ˈsəl-fə-rəs 

-fyə-

also (especially for sense 1a)

ˌsəl-ˈfyu̇r-əs 

variants or chiefly British sulphurous

1

a

: of, relating to, or containing sulfur especially with a lower valence than sulfuric compounds

sulfurous esters

b

: resembling or emanating from sulfur and especially burning sulfur

2

a

: of, relating to, or dealing with the fire of hell : infernal

b

: scathing, virulent

sulfurous denunciations

c

: profane, blasphemous

sulfurous language

sulfurously adverb

sulfurousness noun

Is it sulfur or sulphur?: Usage Guide

The spelling sulfur predominates in U.S. technical usage, while both sulfur and sulphur are common in general usage. British usage tends to favor sulphur for all applications. The same pattern is seen in most of the words derived from sulfur.

Examples of sulfurous in a Sentence

Recent Examples on the Web

The Aliso Canyon gas leak took nearly four months to control, sickened thousands of families and forced them from their homes near the San Fernando Valley to escape a sulfurous stench and maladies including headaches, nausea and nose bleeds. — ABC News, 2 Nov. 2026

Bacteria emit their own VOCs, which can be picked up in human breath (Helicobacter pylori, the bacterium behind stomach ulcers, smells sulfurous, for example). — Marta Zaraaska, Washington Post, 1 Nov. 2026

Sweet onions contain fewer sulfurous compounds than pungent onions. — Rita Pelczar, Better Homes & Gardens, 15 Sep. 2026

These might be mineral water showers or baths, cold-water enemas, or just drinking 3 glasses of stinky, sulfurous spring water daily before breakfast, while strolling and engaging in pleasant conversation on a landscaped promenade. — Veronique Greenwood, Time, 9 July 2026

Word History

First Known Use

15th century, in the meaning defined at sense 1a

Phrases Containing sulfurous

• sulfurous acid

Rhymes for sulfurous

• sulphurous

Kids Definition

sulfurous

adjective

sul·​fu·​rous

variants also sulphurous

ˈsəl-f(y)ə-rəs 

also for sense 1

ˌsəl-ˈfyu̇r-əs 

1

: of, relating to, or containing sulfur

2

a

: of, relating to, or dealing with the fire of hell : infernal

b

: fiery sense 3a, inflamed

a sulfurous sermon

c

: profane sense 2, blasphemous

sulfurous language

Medical Definition

sulfurous

adjective

sul·​fu·​rous

variants or chiefly British sulphurous

ˈsəl-f(y)ə-rəs, also especially for 1 ˌsəl-ˈfyu̇r-əs

1

: of, relating to, or containing sulfur especially with a lower valence than sulfuric compounds

sulfurous esters

2

: resembling or emanating from sulfur and especially burning sulfur