| reenactor | (noun) a person who enacts a role in an event that occurred earlier | - |
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| refectory | (noun) a communal dining-hall (usually in a monastery) | - |
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| reflector | (noun) device that reflects radiation | - |
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| (noun) optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece | Synonyms: reflecting telescope |
| reflectorise | (verb) provide with reflectors, such as chemicals | Synonyms: reflectorize |
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| reflectorize | (verb) provide with reflectors, such as chemicals | Synonyms: reflectorise |
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| refractoriness | (noun) the trait of being unmanageable | Synonyms: recalcitrance, recalcitrancy, unmanageableness |
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| refractory | (adjective) stubbornly resistant to authority or control | Synonyms: fractious, recalcitrant |
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| (adjective) temporarily unresponsive or not fully responsive to a process or stimulus | - |
| (adjective) not responding to treatment | Synonyms: stubborn |
| (noun) lining consisting of material with a high melting point; used to line the inside walls of a furnace | Synonyms: furnace lining |
| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| satisfactorily | (adverb) in a satisfactory manner | - |
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| satisfactoriness | (noun) the quality of giving satisfaction sufficient to meet a demand or requirement | - |
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| satisfactory | (adjective) giving satisfaction | - |
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| (adjective) meeting requirements | Synonyms: acceptable, decent |
| sector | (noun) measuring instrument consisting of two graduated arms hinged at one end | - |
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| (noun) a particular aspect of life or activity | Synonyms: sphere |
| (noun) a social group that forms part of the society or the economy | - |
| (noun) a portion of a military position | - |
| (noun) the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes | - |
| (noun) a plane figure bounded by two radii and the included arc of a circle | - |
| sectorial | (adjective) relating to or resembling a sector | - |
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| selector | (noun) a switch that is used to select among alternatives | Synonyms: selector switch |
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| (noun) a person who chooses or selects out | Synonyms: chooser, picker |
| semiconductor | (noun) a conductor made with semiconducting material | Synonyms: semiconductor device, semiconductor unit |
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| (noun) a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities | Synonyms: semiconducting material |
| subcontractor | (noun) someone who enters into a subcontract with the primary contractor | - |
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| subdirectory | (noun) (computer science) a directory that is listed in another directory | - |
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| subtractor | (noun) An electronic logic circuit for calculating the difference between two binary numbers. | - |
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| suctorial | (adjective) adapted for sucking or clinging by suction | - |
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| tractor | (noun) a wheeled vehicle with large wheels; used in farming and other applications | - |
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| (noun) a truck that has a cab but no body; used for pulling large trailers or vans | - |
| trajectory | (noun) the path followed by an object moving through space | Synonyms: flight |
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| transactor | (noun) someone who conducts or carries on business or negotiations | - |
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| unsatisfactorily | (adverb) in an unsatisfactory manner | - |
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| unsatisfactoriness | (noun) the quality of being inadequate or unsuitable | - |
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| unsatisfactory | (adjective) not giving satisfaction | - |
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| valedictorian | (noun) the student with the best grades who usually delivers the valedictory address at commencement | Synonyms: valedictory speaker |
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| valedictory | (adjective) of or relating to an occasion or expression of farewell | - |
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| (adjective) of a speech expressing leave-taking | - |
| (noun) a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class) | Synonyms: valediction, valedictory address, valedictory oration |
| vasoconstrictor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: pressor, vasoconstrictive |
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| vector | (noun) (genetics) a virus or other agent that is used to deliver DNA to a cell | - |
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| (noun) a variable quantity that can be resolved into components | - |
| (noun) any agent (person or animal or microorganism) that carries and transmits a disease | Synonyms: transmitter |
| (noun) a straight line segment whose length is magnitude and whose orientation in space is direction | - |
| victor | (noun) the contestant who wins the contest | Synonyms: winner |
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| (noun) a combatant who is able to defeat rivals | Synonyms: master, superior |
| victorian | (adjective) exaggeratedly proper | Synonyms: priggish, prim, prissy, prudish, puritanical, square-toed, straight-laced, straightlaced, strait-laced, straitlaced, tight-laced |
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| victorious | (adjective) having won | Synonyms: winning |
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| (adjective) experiencing triumph | Synonyms: triumphant |
| victoriously | (adverb) in a victorious manner | - |
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| victory | (noun) a successful ending of a struggle or contest | Synonyms: triumph |
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