| rectangle | (noun) a parallelogram with four right angles | - |
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| rectangularity | (noun) the property of being shaped like a rectangle | Synonyms: oblongness |
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| rectification | (noun) the act of offering an improvement to replace a mistake; setting right | Synonyms: correction |
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| (noun) determination of the length of a curve; finding a straight line equal in length to a given curve | - |
| (noun) the conversion of alternating current to direct current | - |
| (noun) (chemistry) the process of refinement or purification of a substance by distillation | - |
| rectifier | (noun) electrical device that transforms alternating into direct current | - |
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| (noun) a person who corrects or sets right | - |
| rectilinearity | (noun) the property possessed by a line or surface that is rectilinear, straight. | - |
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| rectitude | (noun) righteousness as a consequence of being honorable and honest | Synonyms: uprightness |
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| recto | (noun) right-hand page | - |
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| rectocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: proctocele |
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| rectoplasty | (noun) reconstructive surgery of the anus or rectum | Synonyms: proctoplasty |
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| rector | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, pastor |
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| rectorate | (noun) the office or station of a rector | Synonyms: rectorship |
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| rectorship | (noun) the office or station of a rector | Synonyms: rectorate |
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| rectory | (noun) an official residence provided by a church for its parson or vicar or rector | Synonyms: parsonage, vicarage |
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| rectum | (noun) the terminal section of the alimentary canal; from the sigmoid flexure to the anus | - |
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| rectus | (noun) any of various straight muscles | - |
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| recuperation | (noun) gradual healing (through rest) after sickness or injury | Synonyms: convalescence, recovery |
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| recurrence | (noun) happening again (especially at regular intervals) | Synonyms: return |
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| recursion | (noun) (mathematics) an expression such that each term is generated by repeating a particular mathematical operation; also, the repeated application or execution of a pattern, function or definition; an expression that is recursive | - |
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| recusal | (noun) (law) the disqualification of a judge or jury by reason of prejudice or conflict of interest; a judge can be recused by objections of either party or judges can disqualify themselves | Synonyms: recusation |
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| recusancy | (noun) refusal to submit to established authority; originally the refusal of Roman Catholics to attend services of the Church of England | - |
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| recusant | (noun) someone who refuses to conform to established standards of conduct | Synonyms: nonconformist |
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| recusation | (noun) (law) the disqualification of a judge or jury by reason of prejudice or conflict of interest; a judge can be recused by objections of either party or judges can disqualify themselves | Synonyms: recusal |
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| (noun) (law) an objection grounded on the judge's relationship to one of the parties | - |
| recycling | (noun) the act of processing used or abandoned materials for use in creating new products | - |
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| (noun) used or abandoned materials for use in creating new products | - |
| resurrection | (noun) a revival from inactivity and disuse | - |
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| scarecrow | (noun) an effigy in the shape of a man to frighten birds away from seeds | Synonyms: bird-scarer, scarer, straw man, strawman |
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| scorecard | (noun) (golf) a record of scores (as in golf) | Synonyms: card |
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| secrecy | (noun) the trait of keeping things secret | Synonyms: secretiveness, silence |
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| (noun) the condition of being concealed or hidden | Synonyms: concealment, privacy, privateness |
| sharecropper | (noun) small farmers and tenants | Synonyms: cropper, sharecrop farmer |
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| shipwreck | (noun) a wrecked ship (or a part of one) | - |
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| (noun) an accident that destroys a ship at sea | Synonyms: wreck |
| (noun) an irretrievable loss | - |
| sprechgesang | (noun) a style of dramatic vocalization between singing and speaking | Synonyms: sprechstimme |
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| sprechstimme | (noun) a style of dramatic vocalization between singing and speaking | Synonyms: sprechgesang |
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| subdirectory | (noun) (computer science) a directory that is listed in another directory | - |
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| tenrec | (noun) small often spiny insectivorous mammal of Madagascar; resembles a hedgehog | Synonyms: tendrac |
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| thermoreceptor | (noun) a sensory receptor that responds to heat and cold | - |
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| underreckoning | (noun) an estimation that is too low; an estimate that is less than the true or actual value | Synonyms: underestimate, underestimation, underrating |
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| vitrectomy | (noun) a surgical procedure that removes the vitreous humor and replace it with saline solution | - |
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| wreck | (noun) a ship that has been destroyed at sea | - |
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| (noun) a serious accident (usually involving one or more vehicles) | Synonyms: crash |
| (noun) an accident that destroys a ship at sea | Synonyms: shipwreck |
| (noun) something or someone that has suffered ruin or dilapidation | - |
| wreckage | (noun) the remaining parts of something that has been wrecked | - |
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| wrecker | (noun) a truck equipped to hoist and pull wrecked cars (or to remove cars from no-parking zones) | Synonyms: tow car, tow truck |
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| (noun) someone who commits sabotage or deliberately causes wrecks | Synonyms: diversionist, saboteur |
| (noun) someone who demolishes or dismantles buildings as a job | - |
| wreckfish | (noun) brown fish of the Atlantic and Mediterranean found around rocks and shipwrecks | Synonyms: Polyprion americanus, stone bass |
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| wrecking | (noun) destruction achieved by causing something to be wrecked or ruined | Synonyms: laying waste, ruin, ruination, ruining |
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| (noun) the event of a structure being completely demolished and leveled | Synonyms: razing |