| 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 | - |