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English Words Starting With S

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

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

strengthen
verbverb-intransitiveverb-transitiveB2
/ˈstreŋθ(ə)n/To make something stronger or more robust.
strep
adjectivenounMedium
/strɛp/A short, informal term for Streptococcus, a genus of bacteria, most commonly referring to the infection it causes.
strep throat
nounMedium
/ˌstrep ˈθrəʊt/A common bacterial infection of the throat and tonsils, caused by streptococcal bacteria, characterised by severe sore throat, fever, and swollen glands.
strepsipteran
adjectivenounVery Low
/strɛpˈsɪptərən/An insect belonging to the order Strepsiptera, a parasitic group where females are typically wingless and larvae develop inside host insects.
strepsipteron
nounVery Low
/strɛpˈsɪptərɒn/A member of the insect order Strepsiptera; a twisted-wing parasite.
strepsirrhine
adjectivenounC2
/ˈstrɛpsɪraɪn/A primate belonging to the suborder Strepsirrhini, which includes lemurs, lorises, and galagos, characterised by a wet, comb-like nose.
streptobacillus
nounRare / Specialized
/ˌstrɛptə(ʊ)bəˈsɪləs/A type of bacterium that is rod-shaped and tends to form chains.
streptocarpus
nounVery low
/ˌstrɛptəʊˈkɑːpəs/A genus of flowering plants in the family Gesneriaceae, native to Africa.
streptococcus
nounC1/C2 (Specialized/Technical)
/ˌstrɛptəˈkɒkəs/A genus of Gram-positive, spherical bacteria that typically grow in chains and are responsible for various diseases in humans and animals.
streptodornase
nounvery low
/ˌstrɛptəʊˈdɔːneɪz/An enzyme produced by streptococci that degrades DNA.
streptokinase
nounVery Low
/ˌstrɛptə(ʊ)ˈkʌɪneɪz/An enzyme derived from certain streptococcal bacteria, used medically to dissolve blood clots.
streptolysin
nounVery low
/ˌstrɛptəʊˈlaɪsɪn/An exotoxin, typically a haemolysin, produced by bacteria of the genus Streptococcus that causes the lysis (destruction) of red blood cells.
streptomyces
nounC2
/ˌstrɛptə(ʊ)ˈmaɪsiːz/A genus of bacteria, important as soil organisms and producers of many antibiotics.
streptomycin
nounRare
/ˌstrɛptə(ʊ)ˈmʌɪsɪn/An antibiotic drug derived from a soil bacterium, used to treat bacterial infections, particularly tuberculosis.
streptothricin
nounVery Low
/ˌstrɛptə(ʊ)ˈθrʌɪsɪn/A basic, water-soluble antibiotic complex produced by certain bacteria of the genus Streptomyces.
stresemann
nounLow / Rare
/ˈʃtreɪzəˌmɑːn/A type of formal men's attire consisting of a morning coat with striped trousers.
stress
nounverbverb-intransitive+1High
/strɛs/A state of mental or emotional strain resulting from demanding or adverse circumstances.
stress ball
nounMedium
/ˈstres ˌbɔːl/A small, soft, squeezable object, often filled with gel or foam, designed to be squeezed repeatedly in the hand to relieve tension or stress.
stress eating
nounCommon in informal contexts; medium overall.
/ˈstres ˌiːtɪŋ/The act of consuming food, especially large amounts of unhealthy food, in direct response to feeling stressed, anxious, or overwhelmed.
stress fracture
nounC1
/ˈstres ˌfræk.tʃər/A small crack in a bone caused by repetitive force or overuse, rather than a single traumatic injury.

Showing 12861–12880 of 15552 words.