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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)

strongyle
nounLow
/ˈstrɒŋɡaɪl/A nematode worm of the genus Strongylus, parasitic in horses and other animals.
strongyloidiasis
nounLow frequency; specialized medical/parasitology term.
/ˌstrɒndʒɪlɔɪˈdaɪəsɪs/An infection caused by parasitic nematodes of the genus Strongyloides, particularly Strongyloides stercoralis.
strongylosis
nounVery Low
/ˌstrɒn.dʒɪˈləʊ.sɪs/A disease in animals, especially horses and livestock, caused by infection with parasitic roundworms of the genus Strongylus.
strontia
nounVery low/Very rare
/ˈstrɒn.ti.ə/A white, solid, alkaline-earth oxide compound, specifically strontium oxide (SrO).
strontian
nounRare
/ˈstrɒntɪən/A mineral containing strontium; of, relating to, or derived from strontium.
strontianite
nounVery Low (C2)
/ˈstrɒn.ti.əˌnaɪt/A rare mineral consisting of strontium carbonate (SrCO₃), typically white or yellowish.
strontium
nounC2
/ˈstrɒn.ti.əm/A soft, silver-yellow metallic chemical element (symbol Sr, atomic number 38), highly reactive with air and water.
strontium 90
nounC2
/ˈstrɒntiəm ˈnʌɪnti/A radioactive isotope of strontium (atomic number 38) with an atomic mass of 90, produced as a byproduct of nuclear fission. It is a significant component of nuclear fallout with a half-life of about 29 years.
strontium hydroxide
nounC2
/ˈstrɒn.ti.əm haɪˈdrɒk.saɪd/A white, crystalline, alkaline compound with the chemical formula Sr(OH)₂, formed by reacting strontium oxide with water.
strontium monoxide
nounVery Low
/ˌstrɒn.ti.əm mɒˈnɒk.saɪd/A chemical compound with the formula SrO, consisting of one strontium atom and one oxygen atom.
strontium unit
nounRare / Very Low
/ˈstrɒn.ti.əm ˈjuː.nɪt/A unit of measurement for the concentration of the radioactive isotope strontium-90, used in radiobiology and environmental science.
strook
verbB1
/strəʊk/A single, continuous movement of a hand, tool, or brush, especially when used to apply, hit, or caress something; also a sudden disabling attack or loss of consciousness in the brain.
strop
nounverbverb-transitiveC1
/strɒp/A leather strap or strip used for sharpening razors.
strophanthin
nounVery Rare / Technical
/strə(ʊ)ˈfanθɪn/A rapid-acting, poisonous cardiac glycoside derived from Strophanthus plants, historically used to treat heart failure.
strophanthus
nounVery Low
/strə(ʊ)ˈfanθəs/A genus of tropical African and Asian woody vines of the dogbane family, or a medicinal substance derived from their seeds.
strophe
nounC2 / Advanced
/ˈstrəʊfi/A stanza, or a repeated group of lines, in a poem or song.
strophoid
nounExtremely rare
/ˈstrɒfɔɪd/A particular type of plane curve generated from a given curve C and two fixed points A (the pole) and O (the fixed point). The strophoid of C with respect to A and O is the locus of points P such that PO = PA' where A' is the reflection of A in the tangent to C at P.
strophulus
nounVery Low
/ˈstrɒfjʊləs/A specific, non-serious skin rash affecting infants, characterized by small red pimples.
stropper
nounRare/Obsolescent
/ˈstrɒp.ər/A person who sharpens razors, cutlery, or other blades on a leather strap called a strop; historically, an occupation requiring specialized skill.
strother
nounVery Low / Obsolete
/ˈstrʌðə/A surname; occasionally used to refer to a landscape of marshy or bushy ground (historical, chiefly British local use).

Showing 13061–13080 of 15552 words.