| rectus | (noun) any of various straight muscles | - |
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| recumb | (verb) lean in a comfortable resting position | Synonyms: recline, repose |
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| recumbent | (adjective) lying down; in a position of comfort or rest | Synonyms: accumbent, decumbent |
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| recuperate | (verb) get over an illness or shock | Synonyms: convalesce, recover |
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| (verb) restore to good health or strength | - |
| (verb) regain a former condition after a financial loss | Synonyms: go back, recover |
| (verb) regain or make up for | Synonyms: recoup, recover |
| recuperation | (noun) gradual healing (through rest) after sickness or injury | Synonyms: convalescence, recovery |
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| recuperative | (adjective) promoting recuperation | Synonyms: restorative |
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| recur | (verb) happen or occur again | Synonyms: repeat |
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| (verb) return in thought or speech to something | Synonyms: go back |
| (verb) have recourse to | Synonyms: fall back, resort |
| recurrence | (noun) happening again (especially at regular intervals) | Synonyms: return |
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| recurrent | (adjective) recurring again and again | Synonyms: perennial, repeated |
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| recurrently | (adverb) in a recurrent manner | - |
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| recurring | (adjective) coming back | Synonyms: revenant |
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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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| recursive | (adjective) of or relating to a recursion | - |
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| recurvate | (adjective) curved backward or inward | Synonyms: recurved |
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| recurve | (verb) curve or bend (something) back or down | - |
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| recurved | (adjective) curved backward or inward | Synonyms: recurvate |
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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 | (adjective) refusing to submit to authority | - |
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| (adjective) (of Catholics) refusing to attend services of the Church of England | Synonyms: dissentient |
| (noun) someone who refuses to conform to established standards of conduct | Synonyms: nonconformist |
| 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 | - |
| recuse | (verb) challenge or except to a judge as being incompetent or interested, in canon and civil law | - |
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| (verb) disqualify oneself (as a judge) in a particular case | - |
| recyclable | (adjective) capable of being used again | Synonyms: reclaimable, reusable |
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| recycle | (verb) use again after processing | Synonyms: reprocess, reuse |
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| (verb) cause to repeat a cycle | - |
| 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 | - |
| redirect | (verb) channel into a new direction | Synonyms: airt |
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| resurrect | (verb) cause to become alive again | Synonyms: raise, upraise |
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| (verb) return from the dead | Synonyms: rise, uprise |
| (verb) restore from a depressed, inactive, or unused state | Synonyms: revive |
| 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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| scarecrowish | (adjective) resembling a scarecrow in being thin and ragged | - |
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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 |
| semiprecious | (adjective) used of gemstones having less commercial value than precious stones | - |
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| 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 | - |
| (verb) destroy a ship | - |
| (verb) cause to experience shipwreck | - |
| (verb) ruin utterly | - |
| (verb) suffer failure, as in some enterprise | - |
| 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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| unappreciated | (adjective) having value that is not acknowledged | Synonyms: unsung, unvalued |
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| (adjective) not likely to be rewarded | Synonyms: thankless, ungratifying |
| unappreciative | (adjective) not feeling or expressing gratitude | - |
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| unappreciatively | (adverb) in an ungrateful manner | Synonyms: ungratefully |
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| uncorrectable | (adjective) incapable of being controlled or managed | Synonyms: uncontrollable, unmanageable |
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| uncorrected | (adjective) left faulty or wrong | - |
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| (adjective) not subjected to correction or discipline | Synonyms: undisciplined |
| 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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| undirected | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, planless, rudderless |
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| unerect | (adjective) not upright in position or posture | - |
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| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |
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| unprecedented | (adjective) having no precedent; novel; never seen before | - |
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| unprecedentedly | (adverb) in an unprecedented manner | - |
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| unreceptive | (adjective) not receptive | - |
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| unreciprocated | (adjective) not returned in kind | Synonyms: unanswered, unrequited |
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| unrecognisable | (adjective) defying recognition as e.g. because of damage or alteration | Synonyms: unrecognizable |
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| (adverb) beyond recognition; in an unrecognizable manner | Synonyms: unrecognizably |
| unrecognised | (adjective) not recognized | Synonyms: unrecognized |
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| (adjective) not having a secure reputation | Synonyms: unrecognized |
| unrecognizable | (adjective) defying recognition as e.g. because of damage or alteration | Synonyms: unrecognisable |
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| unrecognizably | (adverb) beyond recognition; in an unrecognizable manner | Synonyms: unrecognisable |
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| unrecognized | (adjective) not recognized | Synonyms: unrecognised |
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| (adjective) not having a secure reputation | Synonyms: unrecognised |
| unreconcilable | (adjective) impossible to reconcile | Synonyms: irreconcilable |
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| unreconciled | (adjective) not made consistent or compatible | - |
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| unreconstructed | (adjective) adhering to an attitude or position widely held to be outmoded | - |
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| unrecorded | (adjective) actually being performed at the time of hearing or viewing | Synonyms: live |
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| unrecoverable | (adjective) incapable of being recovered or regained | Synonyms: irrecoverable |
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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 | - |
| (verb) smash or break forcefully | Synonyms: bust up, wrack |
| wreckage | (noun) the remaining parts of something that has been wrecked | - |
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| wrecked | (adjective) destroyed in an accident | - |
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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 |