| caffeine | (noun) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects | Synonyms: caffein |
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| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| cysteine | (noun) an amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine | - |
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| fluoresceine | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluorescent dye, resorcinolphthalein |
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| seine | (noun) a large fishnet that hangs vertically, with floats at the top and weights at the bottom | - |
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| (verb) fish with a seine; catch fish with a seine | - |
| theine | (noun) caffeine when present in tea. | - |
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| vicereine | (noun) governor of a country or province who rules as the representative of his or her king or sovereign | Synonyms: viceroy |
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| (noun) wife of a viceroy | - |