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English Words Starting With S

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

sulfonium
nounC2
/sʌlˈfəʊnɪəm/A positively charged ion (cation) containing a central sulfur atom bonded to three organic groups.
sulfoxide
nounC2
/sʌlˈfɒksaɪd/A chemical compound containing a sulfur atom bonded to two carbon atoms and one oxygen atom.
sulfur
nounC1
/ˈsʌl.fə/A pale yellow, non-metallic, odorless chemical element (symbol S, atomic number 16), found in nature and used in industry.
sulfur bacteria
plural-nounC2
/ˈsʌl.fə bækˈtɪə.ri.ə/A type of bacteria, typically anaerobic, that oxidizes hydrogen sulfide or other reduced sulfur compounds to obtain energy, often forming deposits of elemental sulfur.
sulfur butterfly
nounLow
/ˈsʌl.fə ˈbʌt.ə.flaɪ/A butterfly with bright yellow or orange wings, often belonging to the Coliadinae subfamily.
sulfur dioxide
nounC1
/ˌsʌlfə daɪˈɒksaɪd/A toxic gas with the formula SO₂, produced by burning sulfur or certain fossil fuels.
sulfur dye
nounC2
/ˈsʌlfə ˌdaɪ/A type of synthetic dye used for coloring textiles, especially cotton, that is produced from sulfur compounds and requires a specific, often alkaline, reduction process to become soluble for application.
sulfur spring
nounB2
/ˈsʌlfə sprɪŋ/A natural spring whose water contains a significant amount of dissolved hydrogen sulfide gas or other sulfur compounds, often giving it a distinctive 'rotten egg' odor.
sulfur trioxide
nounC2
/ˌsʌl.fə traɪˈɒk.saɪd/A chemical compound with the formula SO₃, formed by the oxidation of sulfur dioxide.
sulfurate
verb-transitiveVery Low (Technical/Scientific)
/ˈsʌlfjʊreɪt/To treat or combine with sulfur, typically as a chemical process.
sulfurated potash
nounVery Rare
/ˌsʌlfjʊreɪtɪd ˈpɒtæʃ/A historical medicinal compound primarily used as a fungicide, consisting of potassium polysulfides dissolved in an aqueous solution.
sulfuret
nounverb-transitiveVery Low
/ˈsʌlfjʊrɛt/A chemical compound containing sulfur, typically used as an alternative term for sulfide in older scientific literature.
sulfureted hydrogen
nounVery Rare
/ˌsʌlfjʊˈrɛtɪd ˈhaɪdrədʒən/An archaic term for hydrogen sulfide (H₂S), a colorless, toxic gas with a characteristic rotten-egg odor, formed by the combination of sulfur with hydrogen.
sulfuric acid
nounC1
/sʌlˌfjʊər.ɪk ˈæs.ɪd/A strong, highly corrosive, dense mineral acid with the chemical formula H₂SO₄.
sulfuric anhydride
nounC2
/sʌlˌfjʊər.ɪk ænˈhaɪ.draɪd/The chemical compound SO₃, a reactive oxide of sulfur that reacts violently with water to form sulfuric acid.
sulfurize
verb-transitiveC2
/ˈsʌlfjʊraɪz/To treat or combine with sulfur.
sulfurous acid
nounLow
/ˌsʌlˈfjʊərəs ˈæsɪd/A weak, unstable acid with the formula H₂SO₃, formed when sulfur dioxide dissolves in water.
sulfuryl chloride
nounVery Low
/ˈsʌlfjʊrɪl ˈklɔːraɪd/A toxic, corrosive inorganic compound with the formula SO₂Cl₂, used as a chlorinating and sulfonating agent in chemical synthesis.
sulfuryl group
nounC1-C2 / Very Low Frequency
/ˈsʌlfjʊrɪl ˌɡruːp/The bivalent molecular group SO₂ (sulfur dioxide group) bound to two other atoms or groups.
sulindac
nounSpecialized / Technical
/sʌˈlɪn.dæk/A nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, inflammation, and stiffness caused by conditions such as osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis.

Showing 13901–13920 of 15552 words.