| ult | (adjective) in or of the month preceding the present one | Synonyms: ultimo |
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| ulterior | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, subterraneous |
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| (adjective) beyond or outside an area of immediate interest; remote | - |
| (adjective) coming at a subsequent time or stage | Synonyms: later, posterior |
| ulteriority | (noun) the quality of being ulterior | - |
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| ulteriorly | (adverb) in an ulterior manner | - |
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| ultima | (noun) the last syllable in a word | - |
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| ultimacy | (noun) the state or degree of being ultimate; the final or most extreme in degree or size or time or distance | Synonyms: ultimateness |
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| ultimate | (adjective) furthest or highest in degree or order; utmost or extreme | - |
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| (adjective) being the last or concluding element of a series | - |
| (noun) the finest or most superior quality of its kind | - |
| ultimately | (adverb) as the end result of a succession or process | Synonyms: at last, at long last, finally, in the end |
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| ultimateness | (noun) the state or degree of being ultimate; the final or most extreme in degree or size or time or distance | Synonyms: ultimacy |
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| ultimatum | (noun) a final peremptory demand | - |
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| ultimo | (adjective) in or of the month preceding the present one | Synonyms: ult |
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| ultra | (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, radical |
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| ultracentrifugation | (noun) centrifugation at very high speeds | - |
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| ultracentrifuge | (noun) a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins | - |
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| (verb) subject to the action of an ultracentrifuge | - |
| ultraconservative | (adjective) extremely conservative | - |
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| (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, reactionary |
| ultramarine | (adjective) of a brilliant pure blue to purplish blue color | - |
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| (noun) a vivid blue to purple-blue color | - |
| (noun) blue pigment made of powdered lapis lazuli | Synonyms: ultramarine blue |
| ultramicroscope | (noun) light microscope that uses scattered light to show particles too small to see with ordinary microscopes | Synonyms: dark-field microscope |
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| ultramicroscopic | (adjective) too small to be seen without an ultramicroscope | - |
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| ultramodern | (adjective) extremely modern | - |
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| ultramodernity | (noun) The property of being extremely modern. | - |
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| ultramontane | (adjective) of or relating to ultramontanism | - |
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| (adjective) on the Italian or Roman side of the Alps | Synonyms: cisalpine |
| (adjective) on or relating to or characteristic of the region or peoples beyond the Alps from Italy (or north of the Alps) | Synonyms: transalpine |
| (noun) a Roman Catholic who advocates ultramontanism (supreme papal authority in matters of faith and discipline) | - |
| ultramontanism | (noun) (Roman Catholic Church) the policy that the absolute authority of the church should be vested in the pope | - |
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| ultranationalism | (noun) fanatical patriotism | Synonyms: chauvinism, jingoism, superpatriotism |
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| ultranationalistic | (adjective) fanatically patriotic | Synonyms: chauvinistic, flag-waving, jingoistic, nationalistic, superpatriotic |
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| ultrasonic | (adjective) having frequencies above those of audible sound | Synonyms: supersonic |
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| ultrasonically | (adverb) by ultrasonic means | - |
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| ultrasonography | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, sonography, ultrasound |
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| ultrasound | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: echography, sonography, ultrasonography |
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| (noun) very high frequency sound; used in ultrasonography | - |
| ultraviolet | (adjective) having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end | - |
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| (noun) radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays | Synonyms: ultraviolet illumination, ultraviolet light, ultraviolet radiation, UV |