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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)

substitution
nounC1
/ˌsʌbstɪˈtjuːʃn/The action of replacing someone or something with another person or thing.
substitution cipher
nounC2
/ˌsʌbstɪˈtjuːʃən ˈsaɪfə/A method of encryption where each letter in the plaintext is replaced by another letter or symbol according to a fixed system.
substitution reaction
nounVery Low
/ˌsʌbstɪˈtjuːʃən riˈækʃən/A chemical reaction where an atom or group in a molecule is replaced by another atom or group.
substitutivity
nounC2
/ˌsʌbstɪtjuːˈtɪvɪti/The property or principle that allows one thing to be replaced by another without changing the truth or validity of a statement.
substrate
nounC1-C2
/ˈsʌb.streɪt/An underlying layer or surface on which something else is applied, exists, or occurs.
substratosphere
nounVery Low
/ˌsʌbˈstræt.ə.sfɪər/A region or layer below the stratosphere, especially the upper troposphere.
substratum
nounC1
/ˈsʌbˌstrɑːtəm/An underlying layer, substance, or foundation; something that lies beneath and supports another layer.
substruction
nounVery Low
/səbˈstrʌkʃ(ə)n/A foundation or supporting structure built underneath something.
substructure
nounC1
/ˈsʌbˌstrʌk.tʃər/An underlying or supporting structure.
subsulfate
nounC2 (Proficient)
/sʌbˈsʌlfeɪt/a basic sulfate, a salt in which the sulfate radical is partially replaced by a base, often of a metal.
subsume
verbverb-transitiveC2 / Very Low Frequency
/səbˈsjuːm/To include or absorb something into a larger or more general category, group, or principle.
subsumed
adjectiveverbLow frequency
/səbˈsjuːmd/To include or absorb something within a larger or more general category, idea, or system.
subsumption
nounC1/C2
/səbˈsʌm(p)ʃ(ə)n/The act of including or absorbing something within a larger or more general category, rule, or idea.
subsystem
nounC1
/ˈsʌbˌsɪs.təm/A system that is part of a larger system.
subtangent
nounRare / Very low frequency
/sʌbˈtæn.dʒənt/In geometry and calculus, the projection of the tangent onto the x-axis; specifically, the length of the segment on the x-axis between the point where the tangent line meets it and the foot of the ordinate (y-coordinate) of the point of tangency.
subteen
adjectivenounLow
/ˌsʌbˈtiːn/A child just below teenage years, typically between about 9 and 12 years old.
subtenant
nounC1
/ˌsʌbˈtɛnənt/A person who rents property from a tenant rather than directly from the landlord.
subtend
verbverb-transitiveLow Frequency
/səbˈtɛnd/(In geometry) to be opposite and mark the limits of (an arc or angle). (In botany) to extend under or be adjacent to (another structure).
subtenure
nounRare
/ˌsʌbˈtɛnjʊə/The tenure by which a subtenant holds property from a tenant; the status or condition of being a subtenant.
subterfuge
nounC1/C2
/ˈsʌb.tə.fjuːdʒ/A deceptive strategy or device used to conceal one's true intentions, avoid blame, or gain an advantage.

Showing 13581–13600 of 15552 words.