| frontierswoman | (noun) a woman who lives on the frontier | - |
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| frontispiece | (noun) front illustration facing the title page of a book | - |
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| (noun) an ornamental facade | - |
| frontlet | (noun) an adornment worn on the forehead | Synonyms: frontal |
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| frontstall | (noun) medieval plate armor to protect a horse's head | Synonyms: chamfron, chanfron, front-stall, testiere |
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| frost | (noun) weather cold enough to cause freezing | Synonyms: freeze |
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| (noun) the formation of frost or ice on a surface | Synonyms: icing |
| (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: hoar, hoarfrost, rime |
| frostbite | (noun) destruction of tissue by freezing and characterized by tingling, blistering and possibly gangrene | Synonyms: cryopathy |
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| frostiness | (noun) coldness as evidenced by frost | - |
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| (noun) a silvery-white color | Synonyms: hoariness |
| frosting | (noun) a flavored sugar topping used to coat and decorate cakes | Synonyms: ice, icing |
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| frostweed | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostwort, Helianthemum canadense |
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| (noun) tall perennial herb having clusters of white flowers; the eastern United States | Synonyms: frost-weed, Verbesina virginica, Virginia crownbeard |
| frostwort | (noun) perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts | Synonyms: Crocanthemum canadense, frost-weed, frostweed, Helianthemum canadense |
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| froth | (noun) a mass of small bubbles formed in or on a liquid | Synonyms: foam |
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| frothiness | (noun) the property of giving off bubbles | Synonyms: bubbliness, effervescence |
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| frottage | (noun) masturbation by rubbing against another person (as in a crowd) | - |
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| frotteur | (noun) someone who masturbates by rubbing against another person (as in a crowd) | - |
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| frown | (noun) a facial expression of dislike or displeasure | Synonyms: scowl |
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| fructification | (noun) organs of fruiting (especially the reproductive parts of ferns and mosses) | - |
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| (noun) the bearing of fruit | - |
| fructose | (noun) a simple sugar found in honey and in many ripe fruits | Synonyms: fruit sugar, laevulose, levulose |
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| fructosuria | (noun) the presence of levulose is the urine | - |
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| frugality | (noun) prudence in avoiding waste | Synonyms: frugalness |
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| frugalness | (noun) prudence in avoiding waste | Synonyms: frugality |
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| fruit | (noun) an amount of a product | Synonyms: yield |
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| (noun) the consequence of some effort or action | - |
| (noun) the ripened reproductive body of a seed plant | - |
| fruitage | (noun) the yield of fruit | - |
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| fruitcake | (noun) a rich cake containing dried fruit and nuts and citrus peel and so on | - |
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| (noun) a whimsically eccentric person | Synonyms: crackpot, crank, nut, nut case, screwball |
| fruiterer | (noun) a person who sells fruit | - |
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| fruitfulness | (noun) the quality of something that causes or assists healthy growth | Synonyms: fecundity |
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| (noun) the intellectual productivity of a creative imagination | Synonyms: fecundity |
| fruition | (noun) something that is made real or concrete | Synonyms: realisation, realization |
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| (noun) enjoyment derived from use or possession | - |
| (noun) the condition of bearing fruit | - |
| fruitlessness | (noun) the quality of yielding nothing of value | Synonyms: aridity, barrenness |
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| (noun) a lack of creative imagination | - |
| fruitlet | (noun) a diminutive fruit, especially one that is part of a multiple fruit | - |
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| fruitwood | (noun) wood of various fruit trees (as apple or cherry or pear) used especially in cabinetwork | - |
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| frumenty | (noun) sweet spiced porridge made from hulled wheat | - |
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| frump | (noun) a dull unattractive unpleasant girl or woman | Synonyms: dog |
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| frustration | (noun) an act of hindering someone's plans or efforts | Synonyms: foiling, thwarting |
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| (noun) the feeling that accompanies an experience of being thwarted in attaining your goals | Synonyms: defeat |
| (noun) a feeling of annoyance at being hindered or criticized | - |
| frustum | (noun) a truncated cone or pyramid; the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed | - |
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| fry | (noun) a young person of either sex | Synonyms: child, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster |
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| fryer | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryolator |
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| (noun) flesh of a medium-sized young chicken suitable for frying | Synonyms: frier, pullet |
| frying | (noun) cooking in fat or oil in a pan or griddle | Synonyms: sauteing |
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| fryolator | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryer |
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| frypan | (noun) a pan used for frying foods | Synonyms: frying pan, skillet |
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| gallimaufry | (noun) a motley assortment of things | Synonyms: farrago, hodgepodge, hotchpotch, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
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| girlfriend | (noun) a girl or young woman with whom a man is romantically involved | Synonyms: girl, lady friend |
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| (noun) any female friend | - |
| grapefruit | (noun) large yellow fruit with somewhat acid juicy pulp; usual serving consists of a half | - |
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| (noun) citrus tree bearing large round edible fruit having a thick yellow rind and juicy somewhat acid pulp | Synonyms: Citrus paradisi |
| hoarfrost | (noun) ice crystals forming a white deposit (especially on objects outside) | Synonyms: frost, hoar, rime |
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| infraction | (noun) a crime less serious than a felony | Synonyms: infringement, misdemeanor, misdemeanour, violation |
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| infrared | (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range | Synonyms: infrared frequency |
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| (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves | Synonyms: infrared emission, infrared light, infrared radiation |
| infrastructure | (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: base |
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| (noun) the basic structure or features of a system or organization | Synonyms: substructure |
| infrequency | (noun) noteworthy scarcity | Synonyms: rareness, rarity |
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| infrigidation | (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: refrigeration |
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| infringement | (noun) a crime less serious than a felony | Synonyms: infraction, misdemeanor, misdemeanour, violation |
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| (noun) an act that disregards an agreement or a right | Synonyms: violation |
| infructescence | (noun) the fruiting stage of the inflorescence | - |
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| jackfruit | (noun) immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted | Synonyms: jack, jak |
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| (noun) East Indian tree cultivated for its immense edible fruit and seeds | Synonyms: Artocarpus heterophyllus, jackfruit tree |
| lakefront | (noun) land bordering a lake | - |
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| leapfrog | (noun) a game in which one child bends down and another leaps over | - |
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| (noun) advancing as if in the child's game, by leaping over obstacles or competitors | - |
| liebfraumilch | (noun) a sweetened Rhenish wine (especially one from Hesse in western Germany) | - |
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| mainframe | (noun) (computer science) the part of a computer (a microprocessor chip) that does most of the data processing | Synonyms: C.P.U., central processing unit, central processor, CPU, processor |
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| (noun) a large digital computer serving 100-400 users and occupying a special air-conditioned room | Synonyms: mainframe computer |
| oceanfront | (noun) land bordering an ocean | - |
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| palfrey | (noun) especially a light saddle horse for a woman | - |
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| permafrost | (noun) ground that is permanently frozen | - |
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| pomfret | (noun) deep-bodied sooty-black pelagic spiny-finned fish of the northern Atlantic and northern Pacific; valued for food | Synonyms: Brama raii |
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| proofreader | (noun) someone who reads proof in order to find errors and mark corrections | Synonyms: reader |
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| refraction | (noun) the amount by which a propagating wave is bent | Synonyms: deflection, deflexion |
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| (noun) the change in direction of a propagating wave (light or sound) when passing from one medium to another | - |
| refractiveness | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractivity |
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| refractivity | (noun) the physical property of a medium as determined by its index of refraction | Synonyms: refractiveness |
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| refractometer | (noun) measuring instrument for measuring the refractive index of a substance | - |
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| refractoriness | (noun) the trait of being unmanageable | Synonyms: recalcitrance, recalcitrancy, unmanageableness |
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| refractory | (noun) lining consisting of material with a high melting point; used to line the inside walls of a furnace | Synonyms: furnace lining |
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| refrain | (noun) the part of a song where a soloist is joined by a group of singers | Synonyms: chorus |
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| refresher | (noun) a course that reviews and updates a topic for those who have not kept abreast of developments | Synonyms: refresher course |
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| (noun) a drink that refreshes | - |
| (noun) a fee (in addition to that marked on the brief) paid to counsel in a case that lasts more than one day | - |
| refreshment | (noun) activity that refreshes and recreates; activity that renews your health and spirits by enjoyment and relaxation | Synonyms: recreation |
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| (noun) snacks and drinks served as a light meal | - |
| refrigerant | (noun) any substance used to provide cooling (as in a refrigerator) | - |
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| refrigeration | (noun) deliberately lowering the body's temperature for therapeutic purposes | - |
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| (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: infrigidation |
| refrigerator | (noun) white goods in which food can be stored at low temperatures | Synonyms: icebox |
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| riffraff | (noun) disparaging terms for the common people | Synonyms: rabble, ragtag, ragtag and bobtail |
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| saffranine | (noun) any of a class of chiefly red organic dyes | Synonyms: safranin, safranine |
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| saffron | (noun) a shade of yellow tinged with orange | Synonyms: orange yellow |
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| (noun) dried pungent stigmas of the Old World saffron crocus | - |
| (noun) Old World crocus having purple or white flowers with aromatic pungent orange stigmas used in flavoring food | Synonyms: Crocus sativus, saffron crocus |
| safranin | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranine |
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| safranine | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranin |
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| sassafras | (noun) dried root bark of the sassafras tree | - |
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| (noun) yellowwood tree with brittle wood and aromatic leaves and bark; source of sassafras oil; widely distributed in eastern North America | Synonyms: Sassafras albidum, sassafras tree |
| saxifrage | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, rockfoil |
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| schoolfriend | (noun) a friend who attends the same school | - |
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| seafront | (noun) the waterfront of a seaside town | - |
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| shirtfront | (noun) a man's detachable insert (usually starched) to simulate the front of a shirt | Synonyms: dickey, dickie, dicky |
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| (noun) the front of a shirt (usually the part not covered by a jacket) | - |
| shopfront | (noun) the front side of a store facing the street; usually contains display windows | Synonyms: storefront |
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| storefront | (noun) the front side of a store facing the street; usually contains display windows | Synonyms: shopfront |
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| suffragan | (noun) an assistant or subordinate bishop of a diocese | Synonyms: suffragan bishop |
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| suffrage | (noun) a legal right guaranteed by the 15th amendment to the US Constitution; guaranteed to women by the 19th amendment | Synonyms: right to vote, vote |
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| suffragette | (noun) a woman advocate of women's right to vote (especially a militant advocate in the United Kingdom at the beginning of the 20th century) | - |
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| suffragism | (noun) the belief that the right to vote should be extended (as to women) | - |
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| suffragist | (noun) an advocate of the extension of voting rights (especially to women) | - |
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| suffrutex | (noun) low-growing woody shrub or perennial with woody base | Synonyms: subshrub |
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| surfriding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfboarding, surfing |
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| taffrail | (noun) the railing around the stern of a ship | - |
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| underframe | (noun) the internal supporting structure that gives an artifact its shape | Synonyms: frame, skeletal frame, skeleton |
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| unfriendliness | (noun) an unfriendly disposition | - |
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| (noun) dislike experienced as an absence of friendliness | - |
| usufruct | (noun) a legal right to use and derive profit from property belonging to someone else provided that the property itself is not injured in any way | - |
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| usufructuary | (noun) someone who holds property by usufruct | - |
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| waterfront | (noun) the area of a city (such as a harbor or dockyard) alongside a body of water | - |
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| wavefront | (noun) (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium | Synonyms: wave front |
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| wolfram | (noun) a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite | Synonyms: atomic number 74, tungsten, W |
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| wolframite | (noun) a mineral consisting of iron and manganese tungstate in crystalline form; the principal ore of tungsten; found in quartz veins associated with granitic rocks | Synonyms: iron manganese tungsten |
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