| redbreast | (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, robin, robin redbreast |
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| redbrush | (noun) common North American shrub with reddish purple twigs and white flowers | Synonyms: American dogwood, Cornus stolonifera, red dogwood, red osier, red osier dogwood |
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| redbud | (noun) small shrubby tree of eastern North America similar to the Judas tree having usually pink flowers; found in damp sheltered underwood | Synonyms: Cercis canadensis |
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| redbug | (noun) larval mite that sucks the blood of vertebrates including human beings causing intense irritation | Synonyms: chigger, harvest mite, jigger |
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| redcap | (noun) a porter who helps passengers with their baggage at a railroad station | - |
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| (noun) a member of the military police in Britain | - |
| redcoat | (noun) British soldier; so-called because of his red coat (especially during the American Revolution) | Synonyms: lobsterback |
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| reddishness | (noun) The quality of being somewhat red. | - |
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| reddle | (noun) a red iron ore used in dyeing and marking | Synonyms: raddle, ruddle |
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| rededication | (noun) a new dedication | - |
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| redeemer | (noun) someone who redeems or buys back (promissory notes or merchandise or commercial paper etc.) | - |
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| redefinition | (noun) the act of giving a new definition | - |
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| redemption | (noun) the act of purchasing back something previously sold | Synonyms: buyback, repurchase |
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| (noun) (theology) the act of delivering from sin or saving from evil | Synonyms: salvation |
| (noun) repayment of the principal amount of a debt or security at or before maturity (as when a corporation repurchases its own stock) | - |
| redeployment | (noun) the withdrawal and redistribution of forces in an attempt to use them more effectively | Synonyms: redisposition |
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| redeposition | (noun) deposition from one deposit to another | - |
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| redetermination | (noun) determining again | - |
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| redevelopment | (noun) the act of improving by renewing and restoring | Synonyms: overhaul, renovation |
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| redeye | (noun) a night flight from which the passengers emerge with eyes red from lack of sleep | Synonyms: redeye flight |
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| redfish | (noun) male salmon that has recently spawned | - |
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| (noun) large edible fish found off coast of United States from Massachusetts to Mexico | Synonyms: channel bass, red drum, Sciaenops ocellatus |
| (noun) North Atlantic rockfish | Synonyms: ocean perch, rosefish |
| redhead | (noun) black-and-white North American woodpecker having a red head and neck | Synonyms: Melanerpes erythrocephalus, redheaded woodpecker |
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| (noun) North American diving duck with a grey-and-black body and reddish-brown head | Synonyms: Aythya americana |
| (noun) someone who has red hair | Synonyms: carrottop, red-header, redheader |
| redheader | (noun) someone who has red hair | Synonyms: carrottop, red-header, redhead |
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| redhorse | (noun) North American sucker with reddish fins | Synonyms: redhorse sucker |
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| rediscovery | (noun) the act of discovering again | - |
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| redisposition | (noun) the withdrawal and redistribution of forces in an attempt to use them more effectively | Synonyms: redeployment |
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| redistribution | (noun) distributing again | - |
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| redmaids | (noun) succulent carpet-forming plant having small brilliant reddish-pink flowers; southwestern United States | Synonyms: Calandrinia ciliata, red maids |
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| redneck | (noun) a poor White person in the southern United States | Synonyms: cracker |
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| redness | (noun) red color or pigment; the chromatic color resembling the hue of blood | Synonyms: red |
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| (noun) a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat | Synonyms: inflammation, rubor |
| redolence | (noun) a pleasingly sweet olfactory property | Synonyms: bouquet, fragrance, fragrancy, sweetness |
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| redoubt | (noun) an entrenched stronghold or refuge | - |
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| (noun) (military) a temporary or supplementary fortification; typically square or polygonal without flanking defenses | - |
| redox | (noun) a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction | Synonyms: oxidation-reduction, oxidoreduction |
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| redpoll | (noun) small siskin-like finch with a red crown and a rosy breast and rump | Synonyms: Carduelis flammea |
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| (noun) small siskin-like finch with a red crown | Synonyms: Carduelis hornemanni |
| redraft | (noun) a draft for the amount of a dishonored draft plus the costs and charges of drafting again | - |
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| redress | (noun) act of correcting an error or a fault or an evil | Synonyms: remediation, remedy |
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| (noun) a sum of money paid in compensation for loss or injury | Synonyms: amends, damages, indemnification, indemnity, restitution |
| redroot | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: bloodroot, puccoon, Sanguinaria canadensis, tetterwort |
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| redshank | (noun) a common Old World wading bird with long red legs | Synonyms: Tringa totanus |
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| redshift | (noun) (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding | Synonyms: red shift |
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| redstart | (noun) European songbird with a reddish breast and tail; related to Old World robins | Synonyms: redtail |
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| (noun) flycatching warbler of eastern North America the male having bright orange on sides and wings and tail | Synonyms: American redstart, Setophaga ruticilla |
| redtail | (noun) dark brown American hawk species having a reddish-brown tail | Synonyms: Buteo jamaicensis, red-tailed hawk |
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| (noun) European songbird with a reddish breast and tail; related to Old World robins | Synonyms: redstart |
| reducer | (noun) pipefitting that joins two pipes of different diameter | - |
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| (noun) a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver | Synonyms: reducing agent, reductant |
| reducing | (noun) any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent | Synonyms: reduction |
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| (noun) loss of excess weight (as by dieting); becoming slimmer | - |
| reductant | (noun) a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver | Synonyms: reducer, reducing agent |
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| reductase | (noun) an enzyme that catalyses the biochemical reduction of some specified substance | - |
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| reductio | (noun) (reduction to the absurd) a disproof by showing that the consequences of the proposition are absurd; or a proof of a proposition by showing that its negation leads to a contradiction | Synonyms: reductio ad absurdum |
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| reduction | (noun) the act of decreasing or reducing something | Synonyms: decrease, diminution, step-down |
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| (noun) the act of reducing complexity | Synonyms: simplification |
| (noun) any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent | Synonyms: reducing |
| reductionism | (noun) a theory that all complex systems can be completely understood in terms of their components | - |
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| (noun) the analysis of complex things into simpler constituents | - |
| reductivism | (noun) an art movement in sculpture and painting that began in the 1950s and emphasized extreme simplification of form and color | Synonyms: minimal art, minimalism |
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| redundance | (noun) the attribute of being superfluous and unneeded | Synonyms: redundancy |
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| redundancy | (noun) repetition of an act needlessly | - |
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| (noun) the attribute of being superfluous and unneeded | Synonyms: redundance |
| (noun) (electronics) a system design that duplicates components to provide alternatives in case one component fails | - |
| (noun) repetition of messages to reduce the probability of errors in transmission | - |
| reduplication | (noun) the act of repeating over and again (or an instance thereof) | Synonyms: reiteration |
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| (noun) a word formed by or containing a repeated syllable or speech sound (usually at the beginning of the word) | - |
| (noun) the syllable added in a reduplicated word form | - |
| (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: anadiplosis |
| reduviid | (noun) a true bug: long-legged predacious bug living mostly on other insects; a few suck blood of mammals | Synonyms: assassin bug |
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| redwing | (noun) small European thrush having reddish flanks | Synonyms: Turdus iliacus |
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| (noun) North American blackbird with scarlet patches on the wings | Synonyms: Agelaius phoeniceus, red-winged blackbird |
| redwood | (noun) the soft reddish wood of either of two species of sequoia trees | - |
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| (noun) either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: sequoia |
| (noun) wood of either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: sequoia |
| reed | (noun) a musical instrument that sounds by means of a vibrating reed | Synonyms: beating-reed instrument, reed instrument |
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| (noun) a vibrator consisting of a thin strip of stiff material that vibrates to produce a tone when air streams over it | Synonyms: vibrating reed |
| (noun) tall woody perennial grasses with hollow slender stems especially of the genera Arundo and Phragmites | - |
| reedbird | (noun) migratory American songbird | Synonyms: bobolink, Dolichonyx oryzivorus, ricebird |
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| (noun) small European warbler that breeds among reeds and wedges and winters in Africa | Synonyms: Acrocephalus schoenobaenus, sedge bird, sedge warbler, sedge wren |
| reedmace | (noun) tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa | Synonyms: bullrush, bulrush, cat's-tail, nailrod, reed mace, Typha latifolia |
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| reef | (noun) one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind | - |
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| (noun) a submerged ridge of rock or coral near the surface of the water | - |
| reefer | (noun) marijuana leaves rolled into a cigarette for smoking | Synonyms: joint, marijuana cigarette, spliff, stick |
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| reek | (noun) a distinctive odor that is offensively unpleasant | Synonyms: fetor, foetor, malodor, malodour, mephitis, stench, stink |
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| reel | (noun) a lively dance of Scottish Highlanders; marked by circular moves and gliding steps | Synonyms: Scottish reel |
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| (noun) an American country dance which starts with the couples facing each other in two lines | Synonyms: Virginia reel |
| (noun) a winder around which thread or tape or film or other flexible materials can be wound | Synonyms: bobbin, spool |
| (noun) winder consisting of a revolving spool with a handle; attached to a fishing rod | - |
| (noun) a roll of photographic film holding a series of frames to be projected by a movie projector | - |
| (noun) music composed for dancing a reel | - |
| reelection | (noun) election again | - |
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| reeler | (noun) a dancer of reels | - |
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| (noun) someone who walks unsteadily as if about to fall | Synonyms: staggerer, totterer |
| reenactment | (noun) performing a role in an event that occurred at an earlier time | - |
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| reenactor | (noun) a person who enacts a role in an event that occurred earlier | - |
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| reenforcement | (noun) a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission | Synonyms: reinforcement, support |
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| (noun) information that makes more forcible or convincing | Synonyms: reinforcement |
| reenlistment | (noun) a renewed enlistment | - |
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| reentry | (noun) the act of entering again | - |
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| reevaluation | (noun) the evaluation of something a second time (or more) | - |
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| reeve | (noun) female ruff | - |
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| reexamination | (noun) a subsequent examination of a patient for the purpose of monitoring earlier treatment | Synonyms: follow-up, followup, review |
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| (noun) (law) questioning of a witness by the party that called the witness after that witness has been subject to cross-examination | Synonyms: redirect examination |
| ref | (noun) (sports) the chief official (as in boxing or American football) who is expected to ensure fair play | Synonyms: referee |
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| refabrication | (noun) assembling again | Synonyms: reassembly |
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| refection | (noun) a light meal or repast | - |
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| refectory | (noun) a communal dining-hall (usually in a monastery) | - |
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| referee | (noun) (sports) the chief official (as in boxing or American football) who is expected to ensure fair play | Synonyms: ref |
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| (noun) someone who reads manuscripts and judges their suitability for publication | Synonyms: reader, reviewer |
| (noun) an attorney appointed by a court to investigate and report on a case | - |
| refereeing | (noun) the act of umpiring | Synonyms: officiating, officiation, umpirage |
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| reference | (noun) the act of referring or consulting | Synonyms: consultation |
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| (noun) the most direct or specific meaning of a word or expression; the class of objects that an expression refers to | Synonyms: denotation, extension |
| (noun) the relation between a word or phrase and the object or idea it refers to | - |
| (noun) a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability | Synonyms: character, character reference |
| (noun) a remark that calls attention to something or someone | Synonyms: mention |
| (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: acknowledgment, citation, cite, credit, mention, quotation |
| (noun) a book to which you can refer for authoritative facts | Synonyms: book of facts, reference book, reference work |
| (noun) an indicator that orients you generally | Synonyms: point of reference, reference point |
| (noun) a publication (or a passage from a publication) that is referred to | Synonyms: source |
| (noun) (computer science) the code that identifies where a piece of information is stored | Synonyms: address, computer address |
| referendum | (noun) a legislative act is referred for final approval to a popular vote by the electorate | - |
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| referent | (noun) something referred to; the object of a reference | - |
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| (noun) the first term in a proposition; the term to which other terms relate | - |
| (noun) something that refers; a term that refers to another term | - |
| referral | (noun) the act of referring (as forwarding an applicant for employment or referring a matter to an appropriate agency) | - |
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| (noun) a recommendation to consult the (professional) person or group to whom one has been referred | - |
| (noun) a person whose case has been referred to a specialist or professional group | - |
| refill | (noun) a commercial product that refills a container with its appropriate contents | - |
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| (noun) a prescription drug that is provided again | - |
| refilling | (noun) filling again by supplying what has been used up | Synonyms: renewal, replacement, replenishment |
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| refinement | (noun) the quality of excellence in thought and manners and taste | Synonyms: civilisation, civilization |
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| (noun) a subtle difference in meaning or opinion or attitude | Synonyms: nicety, nuance, shade, subtlety |
| (noun) the result of improving something | Synonyms: elaboration |
| (noun) the process of removing impurities (as from oil or metals or sugar etc.) | Synonyms: purification, refining |
| (noun) a highly developed state of perfection; having a flawless or impeccable quality | Synonyms: cultivation, culture, finish, polish |
| refiner | (noun) one whose work is to refine a specific thing | - |
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| refinery | (noun) an industrial plant for purifying a crude substance | - |
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| refining | (noun) the process of removing impurities (as from oil or metals or sugar etc.) | Synonyms: purification, refinement |
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| refinisher | (noun) a skilled worker who is employed to restore or refinish buildings or antique furniture | Synonyms: preserver, renovator, restorer |
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| refit | (noun) outfitting a ship again (by repairing or replacing parts) | - |
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| reflation | (noun) inflation of currency after a period of deflation; restore the system to a previous state | - |
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| reflectance | (noun) the fraction of radiant energy that is reflected from a surface | Synonyms: coefficient of reflection, reflection factor, reflectivity |
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| reflection | (noun) the image of something as reflected by a mirror (or other reflective material) | Synonyms: reflexion |
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| (noun) the ability to reflect beams or rays | Synonyms: reflectivity, reflexion |
| (noun) a likeness in which left and right are reversed | Synonyms: mirror image, reflexion |
| (noun) a calm, lengthy, intent consideration | Synonyms: contemplation, musing, reflexion, rumination, thoughtfulness |
| (noun) a remark expressing careful consideration | Synonyms: observation, reflexion |
| (noun) expression without words | Synonyms: expression, manifestation, reflexion |
| (noun) the phenomenon of a propagating wave (light or sound) being thrown back from a surface | Synonyms: reflexion |
| (noun) (mathematics) a transformation in which the direction of one axis is reversed | - |
| reflectiveness | (noun) the capability of quiet thought or contemplation | Synonyms: reflectivity |
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| reflectivity | (noun) the ability to reflect beams or rays | Synonyms: reflection, reflexion |
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| (noun) the capability of quiet thought or contemplation | Synonyms: reflectiveness |
| (noun) the fraction of radiant energy that is reflected from a surface | Synonyms: coefficient of reflection, reflectance, reflection factor |
| reflectometer | (noun) a meter that measures the reflectance of a surface | - |
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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 |
| reflex | (noun) an automatic instinctive unlearned reaction to a stimulus | Synonyms: inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex action, reflex response, unconditioned reflex |
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| reflexion | (noun) the image of something as reflected by a mirror (or other reflective material) | Synonyms: reflection |
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| (noun) the ability to reflect beams or rays | Synonyms: reflection, reflectivity |
| (noun) a likeness in which left and right are reversed | Synonyms: mirror image, reflection |
| (noun) a calm, lengthy, intent consideration | Synonyms: contemplation, musing, reflection, rumination, thoughtfulness |
| (noun) a remark expressing careful consideration | Synonyms: observation, reflection |
| (noun) expression without words | Synonyms: expression, manifestation, reflection |
| (noun) the phenomenon of a propagating wave (light or sound) being thrown back from a surface | Synonyms: reflection |
| reflexive | (noun) a personal pronoun compounded with -self to show the agent's action affects the agent | Synonyms: reflexive pronoun |
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| reflexiveness | (noun) the coreferential relation between a reflexive pronoun and its antecedent | Synonyms: reflexivity |
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| (noun) (logic and mathematics) a relation such that it holds between an element and itself | Synonyms: reflexivity |
| reflexivity | (noun) the coreferential relation between a reflexive pronoun and its antecedent | Synonyms: reflexiveness |
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| (noun) (logic and mathematics) a relation such that it holds between an element and itself | Synonyms: reflexiveness |
| reflexology | (noun) massage to relieve tension by finger pressure; based on the belief that there are reflex points on the feet, hands, and head that are connected to every part of the body | - |
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| (noun) the study of reflex action as it relates to the behavior of organisms | - |