| antherozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: spermatozoid |
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| antihero | (noun) a protagonist who lacks the characteristics that would make him a hero (or her a heroine) | - |
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| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| cheroot | (noun) a cigar with both ends cut flat | - |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| hero | (noun) the principal character in a play or movie or novel or poem | - |
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| (noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States | Synonyms: bomber, Cuban sandwich, grinder, hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep |
| (noun) a person distinguished by exceptional courage and nobility and strength | - |
| (noun) someone who fights for a cause | Synonyms: champion, fighter, paladin |
| (noun) (classical mythology) a being of great strength and courage celebrated for bold exploits; often the offspring of a mortal and a god | - |
| heroic | (noun) a verse form suited to the treatment of heroic or elevated themes; dactylic hexameter or iambic pentameter | Synonyms: heroic meter, heroic verse |
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| heroics | (noun) ostentatious or vainglorious or extravagant or melodramatic conduct | - |
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| heroin | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: diacetylmorphine |
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| heroine | (noun) a woman possessing heroic qualities or a woman who has performed heroic deeds | - |
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| (noun) the main good female character in a work of fiction | - |
| heroism | (noun) the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle) | Synonyms: gallantry, valiance, valiancy, valor, valorousness, valour |
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| heroization | (noun) the act, or the result, of making someone into a hero. | - |
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| heron | (noun) grey or white wading bird with long neck and long legs and (usually) long bill | - |
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| heronry | (noun) a breeding ground for herons; a heron rookery | - |
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| lecherousness | (noun) a strong sexual desire | Synonyms: lust, lustfulness |
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| pheromone | (noun) a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species | - |
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| spherocyte | (noun) an abnormal spherical red blood cell | - |
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| spheroid | (noun) a shape that is generated by rotating an ellipse around one of its axes | Synonyms: ellipsoid of revolution |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| switcheroo | (noun) a sudden unexpected switch | - |
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| theropod | (noun) any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs | Synonyms: bird-footed dinosaur, theropod dinosaur |
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| tocopherol | (noun) a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body | Synonyms: E, vitamin E |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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