| eunuch | (noun) a man who has been castrated and is incapable of reproduction | Synonyms: castrate |
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| eunuchoidism | (noun) the state of being a eunuch (either because of lacking testicles or because they failed to develop) | Synonyms: male hypogonadism |
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| jejunum | (noun) the part of the small intestine between the duodenum and the ileum | - |
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| lunula | (noun) a crescent-shaped metal ornament of the Bronze Age | - |
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| (noun) the crescent-shaped area at the base of the human fingernail | Synonyms: half-moon, lunule |
| lunule | (noun) the crescent-shaped area at the base of the human fingernail | Synonyms: half-moon, lunula |
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| runup | (noun) a substantial increase over a relatively short period of time | Synonyms: run-up |
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| sunup | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise |
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| ununbium | (noun) a radioactive transuranic element, with atomic number 112 | Synonyms: atomic number 112, element 112, Uub |
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| ununhexium | (noun) a radioactive transuranic element, with atomic number 116 | Synonyms: atomic number 116, element 116, Uuh |
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| ununpentium | (noun) a radioactive transuranic element, with atomic number 115 | Synonyms: atomic number 115, element 115, Uup |
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| ununquadium | (noun) a radioactive transuranic element, with atomic number 114 | Synonyms: atomic number 114, element 114, Uuq |
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| ununtrium | (noun) a radioactive transuranic element, with atomic number 113 | Synonyms: atomic number 113, element 113, Uut |
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| unusefulness | (noun) the quality of having no practical use | Synonyms: inutility, uselessness |
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| unusualness | (noun) uncommonness by virtue of being unusual | - |
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