| ulalgia | (noun) pain in the gums | - |
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| ulama | (noun) the body of Mullahs (Muslim scholars trained in Islam and Islamic law) who are the interpreters of Islam's sciences and doctrines and laws and the chief guarantors of continuity in the spiritual and intellectual history of the Islamic community | Synonyms: ulema |
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| ulatrophia | (noun) recession of the gums | - |
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| ulcer | (noun) a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue | Synonyms: ulceration |
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| ulceration | (noun) the process of ulcer formation; the process of becoming ulcerated | - |
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| (noun) a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue | Synonyms: ulcer |
| ulema | (noun) the body of Mullahs (Muslim scholars trained in Islam and Islamic law) who are the interpreters of Islam's sciences and doctrines and laws and the chief guarantors of continuity in the spiritual and intellectual history of the Islamic community | Synonyms: ulama |
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| ulemorrhagia | (noun) bleeding of the gums | - |
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| ulitis | (noun) inflammation of the gums | - |
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| ullage | (noun) the amount that a container (as a wine bottle or tank) lacks of being full | - |
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| ulna | (noun) the inner and longer of the two bones of the human forearm | Synonyms: elbow bone |
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| ulster | (noun) loose long overcoat of heavy fabric; usually belted | - |
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| ulteriority | (noun) the quality of being ulterior | - |
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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 | (noun) the finest or most superior quality of its kind | - |
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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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| 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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| ultraconservative | (noun) an extreme conservative; an opponent of progress or liberalism | Synonyms: extreme right-winger, reactionary |
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| ultramarine | (noun) a vivid blue to purple-blue color | - |
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| (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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| ultramodernity | (noun) The property of being extremely modern. | - |
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| ultramontane | (noun) a Roman Catholic who advocates ultramontanism (supreme papal authority in matters of faith and discipline) | - |
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| 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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| 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 | (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 |
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| ululation | (noun) a long loud emotional utterance | Synonyms: howl, howling |
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