| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| boil | (noun) the temperature at which a liquid boils at sea level | Synonyms: boiling point |
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| (noun) a painful sore with a hard core filled with pus | Synonyms: furuncle |
| broil | (noun) cooking by direct exposure to radiant heat (as over a fire or under a grill) | Synonyms: broiling, grilling |
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| bromoil | (noun) a print made by the bromoil process having soft, paint-like qualities. | - |
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| cinquefoil | (noun) an ornamental carving consisting of five arcs arranged in a circle | - |
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| (noun) any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties | Synonyms: five-finger |
| coil | (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: helix, spiral, volute, whorl |
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| (noun) reactor consisting of a spiral of insulated wire that introduces inductance into a circuit | - |
| (noun) tubing that is wound in a spiral | - |
| (noun) a contraceptive device placed inside a woman's womb | - |
| (noun) a transformer that supplies high voltage to spark plugs in a gasoline engine | - |
| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: curl, curlicue, gyre, ringlet, roll, scroll, whorl |
| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| foil | (noun) a light slender flexible sword tipped by a button | - |
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| (noun) a piece of thin and flexible sheet metal | - |
| (noun) picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector | Synonyms: transparency |
| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: hydrofoil |
| (noun) anything that serves by contrast to call attention to another thing's good qualities | Synonyms: enhancer |
| garboil | (noun) a state of commotion and noise and confusion | Synonyms: tumult, tumultuousness, uproar |
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| gumboil | (noun) a boil or abscess on the gums | - |
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| hydrofoil | (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydroplane |
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| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: foil |
| milfoil | (noun) ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America | Synonyms: Achillea millefolium, yarrow |
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| oil | (noun) oil paint containing pigment that is used by an artist | Synonyms: oil color, oil colour |
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| (noun) any of a group of liquid edible fats that are obtained from plants | Synonyms: vegetable oil |
| (noun) a slippery or viscous liquid or liquefiable substance not miscible with water | - |
| (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, petroleum, rock oil |
| recoil | (noun) a movement back from an impact | Synonyms: backlash, rebound, repercussion |
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| (noun) the backward jerk of a gun when it is fired | Synonyms: kick |
| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
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| soil | (noun) the geographical area under the jurisdiction of a sovereign state | Synonyms: territory |
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| (noun) material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use) | Synonyms: ground, land |
| (noun) anything regarded as making something unclean | Synonyms: dirt, filth, grease, grime, grunge, stain |
| (noun) the part of the earth's surface consisting of humus and disintegrated rock | Synonyms: dirt |
| spoil | (noun) the act of stripping and taking by force | Synonyms: despoilation, despoilment, despoliation, spoilation, spoliation |
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| (noun) the act of spoiling something by causing damage to it | Synonyms: spoilage, spoiling |
| (noun) (usually plural) valuables taken by violence (especially in war) | - |
| subsoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: undersoil |
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| tinfoil | (noun) foil made of tin or an alloy of tin and lead | Synonyms: tin foil |
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| toil | (noun) productive work (especially physical work done for wages) | Synonyms: labor, labour |
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| topsoil | (noun) the layer of soil on the surface | Synonyms: surface soil |
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| trefoil | (noun) an architectural ornament in the form of three arcs arranged in a circle | - |
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| (noun) a plant of the genus Trifolium | Synonyms: clover |
| (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medic, medick |
| turmoil | (noun) disturbance usually in protest | Synonyms: agitation, excitement, hullabaloo, upheaval |
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| (noun) violent agitation | Synonyms: tumult |
| (noun) a violent disturbance | Synonyms: convulsion, upheaval |
| undersoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: subsoil |
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