| ultra | (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, radical |
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| ultraconservative | (adjective) extremely conservative | - |
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| ultramarine | (adjective) of a brilliant pure blue to purplish blue color | - |
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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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| 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 |
| 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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| 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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