| exfiltrate | (verb) escape furtively, as from an area under enemy control | - |
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| (verb) transfer secretly out of an area under enemy control | - |
| filtrate | (noun) the product of filtration; a gas or liquid that has been passed through a filter | - |
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| (verb) remove by passing through a filter | Synonyms: filter, filter out, separate out, strain |
| filtration | (noun) the act of changing a fluid by passing it through a filter | - |
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| (noun) the process whereby fluids pass through a filter or a filtering medium | - |
| infiltrate | (verb) pass through an enemy line; in a military conflict | Synonyms: pass through |
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| (verb) cause (a liquid) to enter by penetrating the interstices | - |
| (verb) pass into or through by filtering or permeating | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: penetrate |
| infiltration | (noun) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) | - |
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| (noun) the slow passage of a liquid through a filtering medium | Synonyms: percolation |
| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |
| 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 |