| registrar | (noun) someone responsible for keeping records | Synonyms: record-keeper, recorder |
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| (noun) the administrator responsible for student records | - |
| (noun) a person employed to keep a record of the owners of stocks and bonds issued by the company | - |
| registration | (noun) the act of enrolling | Synonyms: enrollment, enrolment |
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| (noun) the act of adjusting something to match a standard | Synonyms: adjustment, readjustment |
| (noun) (music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops | - |
| (noun) a document certifying an act of registering | - |
| (noun) the body of people (such as students) who register or enroll at the same time | Synonyms: enrollment |
| registry | (noun) an official written record of names or events or transactions | Synonyms: register |
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| reintroduction | (noun) an act of renewed introduction | - |
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| remonstrance | (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, objection, remonstration |
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| remonstration | (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, objection, remonstrance |
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| repatriate | (noun) a person who has returned to the country of origin or whose citizenship has been restored | - |
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| repatriation | (noun) the act of returning to the country of origin | - |
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| restrainer | (noun) a person who directs and restrains | Synonyms: controller |
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| (noun) a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film | - |
| restraint | (noun) the act of controlling by restraining someone or something | - |
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| (noun) a device that retards something's motion | Synonyms: constraint |
| (noun) discipline in personal and social activities | Synonyms: control |
| (noun) lack of ornamentation | Synonyms: chasteness, simpleness, simplicity |
| (noun) a rule or condition that limits freedom | - |
| (noun) the state of being physically constrained | Synonyms: constraint |
| restriction | (noun) an act of limiting or restricting (as by regulation) | Synonyms: limitation |
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| (noun) the act of keeping something within specified bounds (by force if necessary) | Synonyms: confinement |
| (noun) a principle that limits the extent of something | Synonyms: limitation |
| restrictiveness | (noun) a lack of permissiveness or indulgence and a tendency to confine behavior within certain specified limits | Synonyms: unpermissiveness |
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| (noun) a grammatical qualification that makes the meaning more specific (`red hat' has a more specific meaning than `hat') | - |
| restroom | (noun) a toilet that is available to the public | Synonyms: comfort station, convenience, public convenience, public lavatory, public toilet, toilet facility, wash room |
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| retraction | (noun) the act of pulling or holding or drawing a part back | - |
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| (noun) a disavowal or taking back of a previous assertion | Synonyms: abjuration, recantation |
| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| retraining | (noun) training for a new occupation | - |
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| retread | (noun) a used automobile tire that has been remolded to give it new treads | Synonyms: recap |
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| retreat | (noun) (military) withdrawal of troops to a more favorable position to escape the enemy's superior forces or after a defeat | - |
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| (noun) withdrawal for prayer and study and meditation | Synonyms: retirement |
| (noun) the act of withdrawing or going backward (especially to escape something hazardous or unpleasant) | - |
| (noun) an area where you can be alone | Synonyms: hideaway |
| (noun) (military) a bugle call signaling the lowering of the flag at sunset | - |
| (noun) (military) a signal to begin a withdrawal from a dangerous position | - |
| (noun) a place of privacy; a place affording peace and quiet | - |
| retreatant | (noun) a participant in a religious retreat | - |
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| retreated | (noun) people who have retreated | - |
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| retrenchment | (noun) the reduction of expenditures in order to become financially stable | Synonyms: curtailment, downsizing |
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| (noun) entrenchment consisting of an additional interior fortification to prolong the defense | - |
| retrial | (noun) a new trial in which issues already litigated and to which the court has already rendered a verdict or decision are reexamined by the same court; occurs when the initial trial is found to have been improper or unfair due to procedural errors | - |
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| retribution | (noun) the act of correcting for your wrongdoing | - |
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| (noun) the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life | Synonyms: payback, vengeance |
| (noun) a justly deserved penalty | Synonyms: requital |
| retrieval | (noun) the act of regaining or saving something lost (or in danger of becoming lost) | Synonyms: recovery |
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| (noun) the cognitive operation of accessing information in memory | - |
| (noun) (computer science) the operation of accessing information from the computer's memory | - |
| retriever | (noun) a dog with heavy water-resistant coat that can be trained to retrieve game | - |
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| retro | (noun) a fashion reminiscent of the past | - |
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| retrofit | (noun) the act of adding a component or accessory to something that did not have it when it was manufactured | - |
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| (noun) a component or accessory added to something after it has been manufactured | - |
| retroflection | (noun) the act of bending backward | Synonyms: retroflexion |
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| (noun) an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth | Synonyms: retroflexion |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflexion, retroversion |
| retroflexion | (noun) the act of bending backward | Synonyms: retroflection |
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| (noun) an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth | Synonyms: retroflection |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroversion |
| retrogaming | (noun) The hobby of playing or collecting older video games and computer games. | - |
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| retrogression | (noun) returning to a former state | Synonyms: regress, regression, retroversion, reversion |
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| (noun) passing from a more complex to a simpler biological form | Synonyms: degeneration |
| retronym | (noun) a word introduced because an existing term has become inadequate | - |
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| retrorocket | (noun) a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course | - |
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| retrospect | (noun) contemplation of things past | - |
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| retrospection | (noun) memory for experiences that are past | - |
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| (noun) reference to things past | - |
| retrospective | (noun) an exhibition of a representative selection of an artist's life work | - |
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| retroversion | (noun) returning to a former state | Synonyms: regress, regression, retrogression, reversion |
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| (noun) translation back into the original language | - |
| (noun) a turning or tilting backward of an organ or body part | Synonyms: retroflection, retroflexion |
| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| retrovision | (noun) a vision of events in the distant past | - |
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| rhinotracheitis | (noun) a respiratory infection of the nose and throat in cattle | - |
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| rocketry | (noun) the branch of engineering science that studies rocket design and operation | - |
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| rooftree | (noun) a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters | Synonyms: ridge, ridgepole |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| saltpetre | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, nitre, potassium nitrate, saltpeter |
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| satrap | (noun) a governor of a province in ancient Persia | - |
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| sceptre | (noun) a ceremonial or emblematic staff | Synonyms: scepter, verge, wand |
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| (noun) the imperial authority symbolized by a scepter | Synonyms: scepter |
| schoolmistress | (noun) a woman schoolteacher (especially one regarded as strict) | Synonyms: mistress, schoolma'am, schoolmarm |
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| sculptress | (noun) a woman sculptor | - |
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| seamstress | (noun) a woman who makes or mends dresses | Synonyms: modiste, needlewoman, sempstress |
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| seductress | (noun) a woman who seduces | - |
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| selenolatry | (noun) the worship of the moon | Synonyms: moon-worship |
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| semitrailer | (noun) a trailer having wheels only in the rear; the front is supported by the towing vehicle | Synonyms: semi |
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| semitrance | (noun) a trancelike state in which the person can follow instructions but voluntary action is weak or absent | - |
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| semitransparency | (noun) the quality of allowing light to pass diffusely | Synonyms: translucence, translucency |
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| semitropics | (noun) regions adjacent to the tropics | Synonyms: subtropics |
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| sempstress | (noun) a woman who makes or mends dresses | Synonyms: modiste, needlewoman, seamstress |
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| sentry | (noun) a person employed to keep watch for some anticipated event | Synonyms: lookout, lookout man, picket, scout, sentinel, spotter, watch |
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| separatrix | (noun) a punctuation mark (/) used to separate related items of information | Synonyms: diagonal, slash, solidus, stroke, virgule |
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| sequestration | (noun) the act of segregating or sequestering | Synonyms: segregation |
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| (noun) seizing property that belongs to someone else and holding it until profits pay the demand for which it was seized | Synonyms: requisition |
| (noun) a writ that authorizes the seizure of property | - |
| (noun) the action of forming a chelate or other stable compound with an ion or atom or molecule so that it is no longer available for reactions | - |
| sertraline | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade name Zoloft) | Synonyms: Zoloft |
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| shoestring | (noun) a lace used for fastening shoes | Synonyms: shoe lace, shoe string, shoelace |
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| (noun) a small amount of money | Synonyms: shoe string |
| shoetree | (noun) a wooden or metal device that is inserted into a shoe to preserve its shape when it is not being worn | - |
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| sidestroke | (noun) a swimming stroke in which the arms move forward and backward while the legs do a scissors kick | - |
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| sidetrack | (noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass | Synonyms: railroad siding, siding, turnout |
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| sightreader | (noun) a performer who reads without preparation or prior acquaintance (as in music) | - |
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| sinistrality | (noun) preference for using the left hand | Synonyms: left-handedness |
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| slipstream | (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: airstream, backwash, race, wash |
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| sociometry | (noun) the quantitative study of social relationships | - |
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| somatotrophin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotropic hormone, somatotropin, STH |
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| somatotropin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotrophin, somatotropic hormone, STH |
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| songstress | (noun) a woman songster (especially of popular songs) | - |
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| sophistry | (noun) a deliberately invalid argument displaying ingenuity in reasoning in the hope of deceiving someone | Synonyms: sophism, sophistication |
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| soundtrack | (noun) sound recording on a narrow strip of a motion picture film | - |
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| spectrality | (noun) Quality of being spectral or ghostly. | - |
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| spectre | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, specter, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, specter |
| spectrogram | (noun) a photographic record of a spectrum | Synonyms: spectrograph |
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| spectrograph | (noun) a spectroscope by which spectra can be photographed | - |
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| (noun) a photographic record of a spectrum | Synonyms: spectrogram |
| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrometry | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectroscopic analysis, spectroscopy, spectrum analysis |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| spectroscope | (noun) an optical instrument for spectrographic analysis | Synonyms: prism spectroscope |
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| spectroscopy | (noun) the use of spectroscopes to analyze spectra | Synonyms: spectrographic analysis, spectrometry, spectroscopic analysis, spectrum analysis |
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| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| spirometry | (noun) the use of a spirometer to measure vital capacity | - |
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| sporotrichosis | (noun) a chronic fungal infection of the skin and lymph nodes | - |
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| stabilitron | (noun) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator | Synonyms: zenerdiode |
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| stilbestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, diethylstilboestrol, stilboestrol |
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| stilboestrol | (noun) a potent estrogen used in medicine and in feed for livestock and poultry | Synonyms: DES, diethylstilbestrol, diethylstilboestrol, stilbestrol |
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| stoichiometry | (noun) (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers) | - |
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| strabismus | (noun) abnormal alignment of one or both eyes | Synonyms: squint |
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| strabotomy | (noun) the surgical operation of cutting a muscle or tendon of the eye in order to correct strabismus | - |
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| straddle | (noun) the act of sitting or standing astride | Synonyms: span |
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| (noun) the option to buy or sell a given stock (or stock index or commodity future) at a given price before a given date; consists of an equal number of put and call options | - |
| (noun) a gymnastic exercise performed with a leg on either side of the parallel bars | - |
| (noun) a noncommittal or equivocal position | - |
| strafe | (noun) an attack of machine-gun fire or cannon fire from a low flying airplane | - |
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| strafer | (noun) a combat pilot who strafes the enemy | - |
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| straggle | (noun) a wandering or disorderly grouping (of things or persons) | - |
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| straggler | (noun) someone who strays or falls behind | Synonyms: strayer |
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| straight | (noun) a straight segment of a roadway or racecourse | Synonyms: straightaway |
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| (noun) a poker hand with 5 consecutive cards (regardless of suit) | - |
| (noun) a person having a sexual orientation to persons of the opposite sex | Synonyms: heterosexual, heterosexual person, straight person |
| straightaway | (noun) a straight segment of a roadway or racecourse | Synonyms: straight |
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| straightedge | (noun) hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness) | - |
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| straightener | (noun) a device for straightening | - |
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