| red | (noun) red color or pigment; the chromatic color resembling the hue of blood | Synonyms: redness |
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| (noun) emotionally charged terms used to refer to extreme radicals or revolutionaries | Synonyms: Bolshevik, bolshie, bolshy, Marxist |
| (noun) the amount by which the cost of a business exceeds its revenue | Synonyms: loss, red ink |
| redact | (noun) someone who puts text into appropriate form for publication | Synonyms: redactor, reviser, rewrite man, rewriter |
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| redaction | (noun) the act of putting something in writing | - |
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| (noun) putting something (as a literary work or a legislative bill) into acceptable form | Synonyms: editing |
| redactor | (noun) someone who puts text into appropriate form for publication | Synonyms: redact, reviser, rewrite man, rewriter |
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| redbelly | (noun) freshwater turtle of Chesapeake Bay tributaries having red markings on the lower shell | Synonyms: Pseudemys rubriventris, red-bellied terrapin, red-bellied turtle |
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| redberry | (noun) small spiny evergreen shrub of western United States and Mexico with minute flowers and bright red berries | Synonyms: red-berry, Rhamnus croceus |
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| (noun) North American perennial herb with alternately compound leaves and racemes of small white flowers followed by bright red oval poisonous berries | Synonyms: Actaea rubra, red-berry, red baneberry, snakeberry |
| redbird | (noun) crested thick-billed North American finch having bright red plumage in the male | Synonyms: cardinal, cardinal grosbeak, Cardinalis cardinalis, Richmondena Cardinalis |
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| (noun) the male is bright red with black wings and tail | Synonyms: firebird, Piranga olivacea, scarlet tanager |
| redbone | (noun) a speedy red or red-and-tan American hound | - |
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| 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 |