Browse by letter

English Words Starting With S

15,552 entries — pick a word to see its definition, pronunciation, and usage.

Filter

Parts of speech

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

sulphonic acid
nounVery Low (specialized technical term)
/sʌlˈfɒnɪk ˈasɪd/A class of organic acids containing the functional group -SO₂OH (or -SO₃H) directly attached to a carbon atom.
sulphonium compound
nounC2
/sʌlˈfəʊ.ni.əm ˈkɒm.paʊnd/Any of a class of organic compounds containing a positively charged sulfur atom (S+) bonded to three organic groups and a counterion.
sulphonmethane
nounExtremely Low
/ˌsʌlfɒnˈmiːθeɪn/A specific chemical compound historically used as a sedative or hypnotic drug.
sulphonyl
nounVery Low (Technical/Scientific)
/ˈsʌlfənɪl/A chemical group or radical containing sulfur and oxygen, specifically the bivalent group SO₂.
sulphur
nounMedium
/ˈsʌlfə/A chemical element (symbol S, atomic number 16), a yellow, brittle, non-metallic solid.
sulphur butterfly
nounLow
/ˈsʌlfə ˈbʌtəflaɪ/A common name for various medium-sized butterflies, primarily of the genus Colias, noted for their bright yellow or orange colour, reminiscent of the chemical element sulphur.
sulphur dioxide
nounLow
/ˌsʌl.fə daɪˈɒk.saɪd/A toxic, colourless gas with the chemical formula SO₂, produced by burning sulphur or certain industrial processes.
sulphur springs
nounC1
/ˈsʌl.fə ˌsprɪŋz/A place where water heated by geothermal activity emerges from the ground and has a high sulphur content, often characterised by a distinct odour.
sulphur trioxide
nounVery low
/ˌsʌl.fə traɪˈɒk.saɪd/The chemical compound SO₃, a highly reactive oxide of sulphur.
sulphur tuft
nounC1
/ˌsʌl.fə ˈtʌft/A common, yellow-gilled woodland mushroom (Hypholoma fasciculare) that grows in clusters on dead wood, often on stumps.
sulphur-bottom
nounVery low (archaic/technical historical)
/ˌsʌl.fə ˈbɒt.əm/The common name for the blue whale, specifically referring to the yellowish or mustard-colored film of microscopic diatoms (algae) often seen on its underside in certain waters.
sulphur-crested cockatoo
nounLow to Medium (Common in Australian contexts; low internationally except among bird enthusiasts)
/ˌsʌl.fəˌkres.tɪd ˈkɒk.ə.tuː/A large, white parrot native to Australia and New Guinea, known for the bright yellow crest on its head.
sulphur-flower
nounLow
/ˈsʌl.fə ˌflaʊ.ər/A common name for several wildflower plants, primarily in the genus *Eriogonum*, known for their bright yellow, sulphur-coloured flower clusters.
sulphurate
verbC2/Extremely Rare
/ˈsʌl.fjʊə.reɪt/To treat or combine with sulfur.
sulphuret
verbVery low
/ˈsʌlfjʊrɛt/A binary chemical compound of sulphur with a metal or other element; a sulphide.
sulphuretted hydrogen
nounC1
/ˌsʌlfjʊˈrɛtɪd ˈhaɪdrədʒ(ə)n/The chemical compound H₂S; a colourless, highly toxic, flammable gas with a characteristic foul odour of rotten eggs.
sulphuric acid
nounC1
/sʌlˌfjʊər.ɪk ˈæs.ɪd/A strong, corrosive, dense, oily liquid acid (H₂SO₄) used extensively in industry.
sulphurise
verb-transitiveLow
/ˈsʌlfjəraɪz/To treat, combine, or impregnate with sulphur.
sulphurize
verbC2 / Technical
/ˈsʌlfjʊraɪz/To treat or impregnate with sulphur, especially in chemical or industrial processes.
sulphurous acid
nounC1/C2 (Specialized Technical)
/ˌsʌl.fjʊə.rəs ˈæs.ɪd/A weak, unstable acid formed when sulfur dioxide dissolves in water, with the formula H₂SO₃.

Showing 13941–13960 of 15552 words.