| airflow | (noun) the flow of air | Synonyms: air flow, flow of air |
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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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| bellflower | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: campanula |
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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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| 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 |
| 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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| 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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| 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 | - |
| 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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| 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 |
| dayflower | (noun) any plant of the family Commelinaceae | Synonyms: spiderwort |
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| fingerflower | (noun) tall leafy European biennial or perennial having spectacular clusters of large tubular pink-purple flowers; leaves yield drug digitalis and are poisonous to livestock | Synonyms: common foxglove, Digitalis purpurea, fairy bell, finger-flower, finger-root, fingerroot |
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| flameflower | (noun) plant with fleshy roots and erect stems with narrow succulent leaves and one reddish-orange flower in each upper leaf axil; southwestern United States; Indians once cooked the fleshy roots | Synonyms: flame-flower, flame flower, Talinum aurantiacum |
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| (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, kniphofia, tritoma |
| flow | (noun) the act of flowing or streaming; continuous progression | Synonyms: stream |
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| (noun) the motion characteristic of fluids (liquids or gases) | Synonyms: flowing |
| (noun) dominant course (suggestive of running water) of successive events or ideas | Synonyms: current, stream |
| (noun) any uninterrupted stream or discharge | - |
| (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, menses, menstruation, menstruum, period |
| (noun) something that resembles a flowing stream in moving continuously | Synonyms: stream |
| (noun) the amount of fluid that flows in a given time | Synonyms: flow rate, rate of flow |
| flowage | (noun) the act of flooding; filling to overflowing | Synonyms: flood |
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| (noun) a body of water that has been created by deliberately flooding an area | - |
| (noun) gradual internal motion or deformation of a solid body (as by heat) | - |
| flowchart | (noun) a diagram of the sequence of operations in a computer program or an accounting system | Synonyms: flow chart, flow diagram, flow sheet |
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| flower | (noun) a plant cultivated for its blooms or blossoms | - |
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| (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: bloom, blossom |
| (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, efflorescence, flush, heyday, peak, prime |
| flowerbed | (noun) a bed in which flowers are growing | Synonyms: bed of flowers, flower bed |
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| floweret | (noun) a diminutive flower (especially one that is part of a composite flower) | Synonyms: floret |
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| flowering | (noun) the time and process of budding and unfolding of blossoms | Synonyms: anthesis, blossoming, efflorescence, florescence, inflorescence |
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| (noun) a developmental process | Synonyms: unfolding |
| flowerpot | (noun) a container in which plants are cultivated | Synonyms: pot |
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| flowing | (noun) the motion characteristic of fluids (liquids or gases) | Synonyms: flow |
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| foamflower | (noun) stoloniferous white-flowered spring-blooming woodland plant | Synonyms: coolwart, false miterwort, false mitrewort, Tiarella cordifolia |
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| gillyflower | (noun) Eurasian plant with pink to purple-red spice-scented usually double flowers; widely cultivated in many varieties and many colors | Synonyms: carnation, clove pink, Dianthus caryophyllus |
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| (noun) any of several Old World plants cultivated for their brightly colored flowers | Synonyms: stock |
| globeflower | (noun) any of several plants of the genus Trollius having globose yellow flowers | Synonyms: globe flower |
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| helmetflower | (noun) a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised | Synonyms: skullcap |
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| (noun) a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite | Synonyms: Aconitum napellus, helmet flower, monkshood |
| (noun) any of several orchids of the genus Coryanthes having racemes of a few musky-scented waxy flowers with a helmet-shaped lip process | Synonyms: helmet orchid |
| honeyflower | (noun) Australian shrub whose flowers yield honey copiously | Synonyms: honey-flower, Protea mellifera |
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| (noun) erect bushy shrub of eastern Australia having terminal clusters of red flowers yielding much nectar | Synonyms: honey-flower, Lambertia formosa, mountain devil |
| inflow | (noun) the process of flowing in | Synonyms: influx |
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| lyreflower | (noun) garden plant having deep-pink drooping heart-shaped flowers | Synonyms: bleeding heart, Dicentra spectabilis, lyre-flower |
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| mayflower | (noun) low-growing evergreen shrub of eastern North America with leathery leaves and clusters of fragrant pink or white flowers | Synonyms: Epigaea repens, trailing arbutus |
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| mistflower | (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium | Synonyms: ageratum, Conoclinium coelestinum, Eupatorium coelestinum, mist-flower |
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| moonflower | (noun) pantropical climber having white fragrant nocturnal flowers | Synonyms: belle de nuit, Ipomoea alba |
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| outflow | (noun) the discharge of a fluid from some container | Synonyms: escape, leak, leakage |
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| (noun) a natural flow of ground water | Synonyms: fountain, natural spring, outpouring, spring |
| (noun) the process of flowing out | Synonyms: effluence, efflux |
| overflow | (noun) a large flow | Synonyms: flood, outpouring |
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| (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overspill, runoff |
| pasqueflower | (noun) any plant of the genus Pulsatilla; sometimes included in genus Anemone | Synonyms: pasque flower |
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| passionflower | (noun) any of various chiefly tropical American vines some bearing edible fruit | Synonyms: passionflower vine |
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| safflower | (noun) thistlelike Eurasian plant widely grown for its red or orange flower heads and seeds that yield a valuable oil | Synonyms: Carthamus tinctorius, false saffron |
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| shadflower | (noun) annual weed of Europe and North America having a rosette of basal leaves and tiny flowers followed by oblong seed capsules | Synonyms: Draba verna, shad-flower, whitlow grass |
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| shellflower | (noun) showy perennial of marshlands of eastern and central North America having waxy lanceolate leaves and flower with lower part creamy white and upper parts pale pink to deep purple | Synonyms: Chelone glabra, shell-flower, snake-head, snakehead, turtlehead |
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| (noun) cultivated for its shining oblong leaves and arching clusters of white flowers with pink shading and crinkled yellow lips with variegated magenta stripes | Synonyms: Alpinia speciosa, Alpinia Zerumbet, Languas speciosa, shall-flower, shell ginger |
| snailflower | (noun) perennial tropical American vine cultivated for its racemes of showy yellow and purple flowers having the corolla keel coiled like a snail shell; sometimes placed in genus Phaseolus | Synonyms: corkscrew flower, Phaseolus caracalla, snail-flower, snail bean, snail flower, Vigna caracalla |
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| spiderflower | (noun) any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers | Synonyms: cleome |
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| spoonflower | (noun) tropical American aroid having edible tubers that are cooked and eaten like yams or potatoes | Synonyms: malanga, tannia, Xanthosoma atrovirens, Xanthosoma sagittifolium, yautia |
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| starflower | (noun) common Old World herb having grasslike leaves and clusters of star-shaped white flowers with green stripes; naturalized in the eastern United States | Synonyms: Ornithogalum umbellatum, sleepy dick, summer snowflake |
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| strawflower | (noun) Australian plant naturalized in Spain having flowers of lemon yellow to deep gold; the frequent choice of those who love dried flowers | Synonyms: golden everlasting, Helichrysum bracteatum, yellow paper daisy |
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| (noun) any of various plants of the genus Helipterum | - |
| (noun) plant of southern and southeastern United States grown for its yellow flowers that can be dried | Synonyms: cornflower, Uvularia grandiflora |
| sunflower | (noun) any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays | Synonyms: helianthus |
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| swanflower | (noun) any of several orchids of the genus Cycnoches having slender arching columns of flowers suggesting the neck of a swan | Synonyms: swan-flower, swan-neck, swan orchid, swanneck |
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| tailflower | (noun) any of various tropical American plants cultivated for their showy foliage and flowers | Synonyms: anthurium, tail-flower |
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| tongueflower | (noun) orchid having blue to purple flowers with tongue-shaped or strap-shaped protuberances (calli) at the lip base | Synonyms: tongue-flower |
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| twinflower | (noun) creeping evergreen subshrub of the northern parts of Europe and Asia with delicate fragrant tubular bell-shaped usually pink flowers borne in pairs | Synonyms: Linnaea borealis |
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| wallflower | (noun) remains on sidelines at social event | - |
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| (noun) perennial of southern Europe having clusters of fragrant flowers of all colors especially yellow and orange; often naturalized on old walls or cliffs; sometimes placed in genus Erysimum | Synonyms: Cheiranthus cheiri, Erysimum cheiri |
| (noun) any of numerous plants of the genus Erysimum having fragrant yellow or orange or brownish flowers | - |
| wandflower | (noun) tufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall | Synonyms: beetleweed, coltsfoot, galax, Galax urceolata, galaxy |
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| (noun) a showy often-cultivated plant with tawny yellow often purple-spotted flowers | Synonyms: Sparaxis tricolor |
| waxflower | (noun) small waxy white or pinkish-white saprophytic woodland plant having scalelike leaves and a nodding flower; turns black with age | Synonyms: Indian pipe, Monotropa uniflora |
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| (noun) epiphytic clusia of British Guiana | Synonyms: Clusia insignis |
| (noun) twining woody vine of Madagascar having thick dark waxy evergreen leaves and clusters of large fragrant waxy white flowers along the stems; widely cultivated in warm regions | Synonyms: Madagascar jasmine, Stephanotis floribunda |
| wildflower | (noun) wild or uncultivated flowering plant | Synonyms: wild flower |
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| windflower | (noun) any woodland plant of the genus Anemone grown for its beautiful flowers and whorls of dissected leaves | Synonyms: anemone |
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| workflow | (noun) progress (or rate of progress) in work being done | Synonyms: work flow |
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