| afflatus | (noun) a strong creative impulse; divine inspiration | - |
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| afflict | (verb) cause physical pain or suffering in | Synonyms: smite |
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| (verb) cause great unhappiness for; distress | - |
| afflicted | (adjective) grievously affected especially by disease | Synonyms: stricken |
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| (adjective) mentally or physically unfit | Synonyms: impaired |
| affliction | (noun) a cause of great suffering and distress | - |
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| (noun) a condition of suffering or distress due to ill health | - |
| (noun) a state of great suffering and distress due to adversity | - |
| afflictive | (adjective) causing misery or pain or distress | Synonyms: painful, sore |
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| affluence | (noun) abundant wealth | Synonyms: richness |
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| affluent | (adjective) having an abundant supply of money or possessions of value | Synonyms: flush, loaded, moneyed, substantial, wealthy |
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| (noun) a branch that flows into the main stream | Synonyms: confluent, feeder, tributary |
| (noun) an affluent person; a person who is financially well off | - |
| affluenza | (noun) an inability to understand the consequences of one's actions because of financial privilege | - |
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| aflame | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflare, alight, on fire |
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| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: ablaze, aroused |
| aflare | (adjective) lighted up by or as by fire or flame | Synonyms: ablaze, afire, aflame, alight, on fire |
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| (adjective) streaming or flapping or spreading wide as if in a current of air | Synonyms: flaring |
| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| aflicker | (adjective) shining unsteadily | Synonyms: flickering |
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| afloat | (adjective) borne on the water; floating | - |
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| (adjective) covered with water | Synonyms: awash, flooded, inundated, overflowing |
| (adjective) aimlessly drifting | Synonyms: adrift, aimless, directionless, planless, rudderless, undirected |
| aflutter | (adjective) excited in anticipation | Synonyms: nervous |
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| airflow | (noun) the flow of air | Synonyms: air flow, flow of air |
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| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| backflow | (noun) a flow that returns toward its source | Synonyms: backflowing |
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| backflowing | (noun) a flow that returns toward its source | Synonyms: backflow |
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| baffle | (noun) a flat plate that controls or directs the flow of fluid or energy | Synonyms: baffle board |
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| (verb) restrain the emission of (sound, fluid, etc.) | Synonyms: regulate |
| (verb) be a mystery or bewildering to | Synonyms: amaze, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex |
| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: bilk, cross, foil, frustrate, queer, scotch, spoil, thwart |
| baffled | (adjective) perplexed by many conflicting situations or statements; filled with bewilderment | Synonyms: at sea, befuddled, bemused, bewildered, confounded, confused, lost, mazed, mixed-up |
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| (noun) people who are frustrated and perplexed | - |
| bafflement | (noun) confusion resulting from failure to understand | Synonyms: befuddlement, bemusement, bewilderment, mystification, obfuscation, puzzlement |
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| baffling | (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: elusive, knotty, problematic, problematical, tough |
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| bellflower | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: campanula |
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| biflagellate | (adjective) having two flagella | - |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blowfly | (noun) large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds | Synonyms: blow fly |
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| bluffly | (adverb) in a blunt direct manner | Synonyms: bluntly, brusquely, flat out, roundly |
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| bobfloat | (noun) a small float usually made of cork; attached to a fishing line | Synonyms: bob, bobber, cork |
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| botfly | (noun) stout-bodied hairy dipterous fly whose larvae are parasites on humans and other mammals | - |
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| briefless | (adjective) (of lawyers or barristers) lacking clients | - |
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| briefly | (adverb) for a short time | - |
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| (adverb) in a concise manner; in a few words | Synonyms: concisely, in brief, in short, shortly |
| bufflehead | (noun) small North American diving duck; males have bushy head plumage | Synonyms: Bucephela albeola, butterball, dipper |
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| butterflower | (noun) any of various plants of the genus Ranunculus | Synonyms: butter-flower, buttercup, crowfoot, goldcup, kingcup |
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| butterfly | (noun) a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down | Synonyms: butterfly stroke |
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| (noun) diurnal insect typically having a slender body with knobbed antennae and broad colorful wings | - |
| (verb) talk or behave amorously, without serious intentions | Synonyms: chat up, coquet, coquette, dally, flirt, mash, philander, romance |
| (verb) cut and spread open, as in preparation for cooking | - |
| (verb) flutter like a butterfly | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| camouflage | (noun) the act of concealing the identity of something by modifying its appearance | Synonyms: disguise |
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| (noun) device or stratagem for concealment or deceit | - |
| (noun) fabric dyed with splotches of green and brown and black and tan; intended to make the wearer of a garment made of this fabric hard to distinguish from the background | Synonyms: camo |
| (noun) an outward semblance that misrepresents the true nature of something | Synonyms: disguise |
| (verb) disguise by camouflaging; exploit the natural surroundings to disguise something | - |
| camouflaged | (adjective) made invisible by means of protective coloring | - |
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| candyfloss | (noun) a candy made by spinning sugar that has been boiled to a high temperature | Synonyms: cotton candy, spun sugar |
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| catchfly | (noun) mostly perennial herbs with sticky stems that catch insects; widespread in north temperate zone | Synonyms: lychnis |
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| (noun) any plant of the genus Silene | Synonyms: campion, silene |
| cauliflower | (noun) compact head of white undeveloped flowers | - |
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| (noun) a plant having a large edible head of crowded white flower buds | Synonyms: Brassica oleracea botrytis |
| chafflike | (adjective) abounding in or covered with or resembling or consisting of chaff | Synonyms: chaffy |
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| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| cheeseflower | (noun) erect or decumbent Old World perennial with axillary clusters of rosy-purple flowers; introduced in United States | Synonyms: cheese, high mallow, Malva sylvestris, tall mallow |
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| chiefly | (adverb) for the most part | Synonyms: in the main, mainly, primarily, principally |
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| chiggerflower | (noun) erect perennial of eastern and southern United States having showy orange flowers | Synonyms: Asclepias tuberosa, butterfly weed, chigger flower, Indian paintbrush, orange milkweed, pleurisy root, tuber root |
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| chlorofluorocarbon | (noun) a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans | Synonyms: CFC |
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| ciprofloxacin | (noun) an oral antibiotic (trade name Cipro) used against serious bacterial infections of the skin or respiratory tract or urinary tract or bones or joints | Synonyms: Cipro |
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| circumflex | (noun) a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality | - |
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| coneflower | (noun) any of various perennials of the eastern United States having thick rough leaves and long-stalked showy flowers with drooping rays and a conelike center | - |
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| (noun) any of various plants of the genus Rudbeckia cultivated for their large usually yellow daisies with prominent central cones | - |
| (noun) a wildflower of the genus Ratibida | - |
| conflagrate | (verb) start to burn or burst into flames | Synonyms: catch fire, combust, erupt, ignite, take fire |
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| (verb) cause to start burning | Synonyms: enkindle, inflame, kindle |
| conflagration | (noun) a very intense and uncontrolled fire | Synonyms: inferno |
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| conflate | (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, flux, fuse, immix, meld, merge, mix |
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| conflict | (noun) an open clash between two opposing groups (or individuals) | Synonyms: battle, struggle |
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| (noun) a hostile meeting of opposing military forces in the course of a war | Synonyms: battle, engagement, fight |
| (noun) an incompatibility of dates or events | - |
| (noun) a disagreement or argument about something important | Synonyms: difference, difference of opinion, dispute |
| (noun) opposition between two simultaneous but incompatible feelings | - |
| (noun) opposition in a work of drama or fiction between characters or forces (especially an opposition that motivates the development of the plot) | - |
| (noun) a state of opposition between persons or ideas or interests | - |
| (verb) go against, as of rules and laws | Synonyms: contravene, infringe, run afoul |
| (verb) be in conflict | - |
| conflicting | (adjective) in disagreement | Synonyms: at odds, contradictory, self-contradictory |
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| (adjective) on bad terms | - |
| confluence | (noun) a flowing together | Synonyms: conflux, merging |
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| (noun) a coming together of people | Synonyms: concourse |
| (noun) a place where things merge or flow together (especially rivers) | Synonyms: meeting |
| confluent | (adjective) flowing together | Synonyms: merging |
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| (noun) a branch that flows into the main stream | Synonyms: affluent, feeder, tributary |
| conflux | (noun) a flowing together | Synonyms: confluence, merging |
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| cornflour | (noun) starch prepared from the grains of corn; used in cooking as a thickener | Synonyms: cornstarch |
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| cornflower | (noun) an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers | Synonyms: bachelor's button, bluebottle, Centaurea cyanus |
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| (noun) plant of southern and southeastern United States grown for its yellow flowers that can be dried | Synonyms: strawflower, Uvularia grandiflora |
| cuckooflower | (noun) a bitter cress of Europe and America | Synonyms: Cardamine pratensis, cuckoo flower, lady's smock, meadow cress |
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| cufflink | (noun) jewelry consisting of one of a pair of linked buttons used to fasten the cuffs of a shirt | - |
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| cupflower | (noun) any of various plants of the genus Nierembergia having upturned bell-shaped flowers | Synonyms: nierembergia |
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| (noun) Mexican evergreen climbing plant having large solitary funnel-shaped fragrant yellow flowers with purple-brown ridges in the throat | Synonyms: chalice vine, Solandra guttata, trumpet flower |
| damselfly | (noun) slender non-stinging insect similar to but smaller than the dragonfly but having wings folded when at rest | - |
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| dayflower | (noun) any plant of the family Commelinaceae | Synonyms: spiderwort |
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| dayfly | (noun) slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days | Synonyms: mayfly, shadfly |
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| deflagrate | (verb) burn with great heat and intense light | - |
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| (verb) cause to burn rapidly and with great intensity | - |
| deflagration | (noun) combustion that propagates through a gas or along the surface of an explosive at a rapid rate driven by the transfer of heat | - |
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| deflate | (verb) become deflated or flaccid, as by losing air | - |
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| (verb) reduce or cut back the amount or availability of, creating a decline in value or prices | - |
| (verb) produce deflation in | - |
| (verb) reduce or lessen the size or importance of | Synonyms: puncture |
| (verb) release contained air or gas from | - |
| (verb) collapse by releasing contained air or gas | - |
| deflated | (adjective) brought low in spirit | Synonyms: chapfallen, chopfallen, crestfallen |
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| deflation | (noun) the act of letting the air out of something | - |
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| (noun) a contraction of economic activity resulting in a decline of prices | - |
| (noun) (geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind | - |
| deflationary | (adjective) associated with or tending to cause decreases in consumer prices or increases in the purchasing power of money | - |
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| deflator | (noun) a statistical factor designed to remove the effect of inflation; inflation adjusted variables are in constant dollars | - |
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| deflect | (verb) impede the movement of (an opponent or a ball) | Synonyms: block, parry |
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| (verb) draw someone's attention away from something | Synonyms: distract |
| (verb) turn aside and away from an initial or intended course | - |
| (verb) turn from a straight course, fixed direction, or line of interest | Synonyms: bend, turn away |
| (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, debar, fend off, forefend, forfend, head off, obviate, stave off, ward off |
| deflection | (noun) a turning aside (of your course or attention or concern) | Synonyms: deflexion, deviation, digression, divagation, diversion |
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| (noun) the property of being bent or deflected | Synonyms: bending, deflexion |
| (noun) the amount by which a propagating wave is bent | Synonyms: deflexion, refraction |
| (noun) the movement of the pointer or pen of a measuring instrument from its zero position | Synonyms: deflexion |
| (noun) a twist or aberration; especially a perverse or abnormal way of judging or acting | Synonyms: warp |
| deflective | (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: refractive |
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| deflector | (noun) a device intended to turn aside the flow of something (water or air or smoke etc) | - |
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| deflexion | (noun) a turning aside (of your course or attention or concern) | Synonyms: deflection, deviation, digression, divagation, diversion |
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| (noun) the property of being bent or deflected | Synonyms: bending, deflection |
| (noun) the amount by which a propagating wave is bent | Synonyms: deflection, refraction |
| (noun) the movement of the pointer or pen of a measuring instrument from its zero position | Synonyms: deflection |
| defloration | (noun) the act of depriving a woman of her virginity (especially by rupturing the hymen through sexual intercourse) | - |
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| (noun) an act that despoils the innocence or beauty of something | - |
| deflower | (verb) make imperfect | Synonyms: impair, mar, spoil, vitiate |
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| (verb) deprive of virginity | Synonyms: ruin |
| difflugia | (noun) a protozoan with an ovoid shell of cemented sand grains | - |
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| diflunisal | (noun) nonsteroidal anti-inflammatory (trade name Dolobid) used to treat arthritis and other inflammatory conditions | Synonyms: Dolobid |
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| dinoflagellate | (noun) chiefly marine protozoa having two flagella; a chief constituent of plankton | - |
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| disfluency | (noun) lack of skillfulness in speaking or writing | - |
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| disinflation | (noun) a reduction of prices intended to improve the balance of payments | - |
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| dobsonfly | (noun) large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait | Synonyms: Corydalus cornutus, dobson, dobson fly |
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| dorsiflexion | (noun) the act of bending backward (of the body or a body part) | - |
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| dragonfly | (noun) slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc. | Synonyms: darning needle, devil's darning needle, mosquito hawk, sewing needle, skeeter hawk, snake doctor, snake feeder |
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| duffle | (noun) a coarse heavy woolen fabric | Synonyms: duffel |
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| (noun) a large cylindrical bag of heavy cloth; for carrying personal belongings | Synonyms: duffel, duffel bag, duffle bag |
| earflap | (noun) one of two flaps attached to a cap to keep the ears warm | Synonyms: earlap |
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| effleurage | (noun) a rhythmic stroking | - |
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| effloresce | (verb) come into or as if into flower | Synonyms: burst forth |
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| (verb) assume crystalline form; become crystallized | Synonyms: crystalise, crystalize, crystallize |
| (verb) become encrusted with crystals due to evaporation | - |
| efflorescence | (noun) a powdery deposit on a surface | Synonyms: bloom |
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| (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, florescence, flowering, inflorescence |
| (noun) any red eruption of the skin | Synonyms: rash, roseola, skin rash |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, flower, flush, heyday, peak, prime |
| efflorescent | (adjective) when the bud, or buds, on a plant are bursting into flower | Synonyms: abloom |
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| effluence | (noun) the process of flowing out | Synonyms: efflux, outflow |
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| effluent | (adjective) that is flowing outward | Synonyms: outflowing |
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| (noun) water mixed with waste matter | Synonyms: sewer water, wastewater |