| dithyramb | (noun) (ancient Greece) a passionate hymn (usually in honor of Dionysus) | - |
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| (noun) a wildly enthusiastic speech or piece of writing | - |
| eyra | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: Felis yagouaroundi, jaguarondi, jaguarundi, jaguarundi cat |
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| gyration | (noun) the act of rotating in a circle or spiral | Synonyms: whirling |
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| (noun) a single complete turn (axial or orbital) | Synonyms: revolution, rotation |
| hayrack | (noun) a frame attached to a wagon to increase the amount of hay it can carry | Synonyms: hayrig |
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| (noun) a rack that holds hay for feeding livestock | - |
| hyrax | (noun) any of several small ungulate mammals of Africa and Asia with rodent-like incisors and feet with hooflike toes | Synonyms: coney, cony, das, dassie |
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| palmyra | (noun) tall fan palm of Africa and India and Malaysia yielding a hard wood and sweet sap that is a source of palm wine and sugar; leaves used for thatching and weaving | Synonyms: Borassus flabellifer, longar palm, lontar, palmyra palm, toddy palm, wine palm |
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| pyracanth | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, firethorn, Pyracantha |
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| pyralid | (noun) usually tropical slender-bodied long-legged moth whose larvae are crop pests | Synonyms: pyralid moth |
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| pyramid | (noun) (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases | - |
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| (noun) a polyhedron having a polygonal base and triangular sides with a common vertex | - |
| pyramiding | (noun) a fraudulent business practice involving some form of pyramid scheme e.g., the chain of distribution is artificially expanded by an excessive number of distributors selling to other distributors at progressively higher wholesale prices until retail prices are unnecessarily inflated | - |
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| spirogyra | (noun) freshwater algae consisting of minute filaments containing spiral chlorophyll bands | - |
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| styracosaur | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaurus |
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| styracosaurus | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaur |
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| styrax | (noun) any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage | - |
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| tayra | (noun) long-tailed arboreal mustelid of Central America and South America | Synonyms: Eira barbara, taira |
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| tyramine | (noun) amino acid derived from tyrosine; has a sympathomimetic action; found in chocolate and cola drinks and ripe cheese and beer | - |
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| tyrannicide | (noun) killing a tyrant | - |
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| tyrannid | (noun) a passerine bird of the suborder Tyranni | - |
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| tyrannosaur | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaurus, Tyrannosaurus rex |
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| tyrannosaurus | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaur, Tyrannosaurus rex |
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| tyranny | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, authoritarianism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism |
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| (noun) dominance through threat of punishment and violence | Synonyms: absolutism, despotism |
| tyrant | (noun) a cruel and oppressive dictator | Synonyms: autocrat, despot |
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| (noun) any person who exercises power in a cruel way | - |
| (noun) in ancient Greece, a ruler who had seized power without legal right to it | - |