| 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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| 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 |
| 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 |
| 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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| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
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| tinfoil | (noun) foil made of tin or an alloy of tin and lead | Synonyms: tin foil |
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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 |