| tryptophane | (noun) an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin | Synonyms: tryptophan |
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| unstoppable | (adjective) not capable of being stopped | - |
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| unstoppered | (adjective) (of a container) having the stopper removed | - |
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| utopia | (noun) a work of fiction describing a utopia | - |
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| (noun) ideally perfect state; especially in its social and political and moral aspects | - |
| utopian | (adjective) characterized by or aspiring to impracticable perfection | - |
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| (adjective) of or pertaining to or resembling a utopia | Synonyms: Utopian |
| uvulopalatopharyngoplasty | (noun) surgical resection of unnecessary palatal and oropharyngeal tissue to open the airway; intended to cure extreme cases of snoring (with or without sleep apnea) | Synonyms: palatopharyngoplasty, PPP, UPPP |
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| whistlestop | (verb) tour the country in order to solicit votes for an election | - |
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