| Xavier {prop} (male given name) | :: Xavér |
| xebec {n} (transport ship) | :: chebek |
| xenoglossy {n} (knowledge of a language one has never learned) | :: xenoglosszia |
| xenolith {n} (geology: any piece of rock having a different origin to that of the igneous rock in which it is found) | :: zárvány |
| xenon {n} (chemical element) | :: xenon |
| xenon flash lamp {n} (a lamp that produces a short, intense flash of light) | :: xenon villanólámpa |
| xenophobe {n} (hater of foreigners) | :: xenofób |
| xenophobia {n} (a pathological fear or hatred of strangers or foreigners) | :: xenofóbia, idegengyűlölet |
| xenophobic {n} (xenophobe) SEE: xenophobe | :: |
| xenophobic {adj} (exhibiting or characterised by xenophobia) | :: xenofób |
| xenotransplantation {n} (transplantation between species) | :: xenotranszplantáció |
| Xerxes {prop} | :: Xerxész |
| x-height {n} (the distance between the baseline and midline in a typeface) | :: betűszem, középmagasság |
| xi {n} (Greek letter) | :: kszi |
| Xi {prop} (Chinese surname) | :: Hszi |
| Xiamen {prop} (a sub-provincial city in southeastern China) | :: Hsziamen |
| Xi'an {prop} (a city of China) | :: Hszian |
| Xianggang {prop} (Hong Kong) SEE: Hong Kong | :: |
| Xiangyang {prop} (prefecture-level city in central China) | :: Hsziangjang |
| Xining {prop} (a city of China) | :: Hszining |
| Xinjiang {prop} (autonomous region of China) | :: Ujgúria, Hszincsiang |
| Xinyang {prop} (a city in China) | :: Hszinjang |
| xiphias {n} (xiphias) SEE: swordfish | :: |
| xiphoid process {n} (cartilaginous extension) | :: kardnyúlvány |
| Xizang {prop} (Tibet) SEE: Tibet | :: |
| xoanon {n} (wooden statue used as a cult image in Ancient Greece) | :: xoanon |
| xor {n} (exclusive OR) | :: kizáró vagy |
| XOR {n} (logic: connective) | :: kizáró vagy |
| X-ray {n} (short wavelength electromagnetic radiation) | :: röntgensugárzás |
| X-ray {n} (photograph made with X-rays) | :: röntgen |
| X-ray {n} (X-ray machine) | :: röntgenberendezés |
| X-ray {v} (to take a radiograph of) | :: röntgenez |
| X-ray {adj} (of or having to do with X-rays) | :: röntgen |
| X-ray diffraction {n} ((physics)) | :: röntgendiffrakció |
| Xuzhou {prop} (a prefecture-level city of Jiangsu, China) | :: Hszücsou |
| xylem {n} (botany: vascular tissue in land plants) | :: farész |
| xylene {n} (di-methyl-benzene) | :: xilol |
| xylitol {n} (an alcohol) | :: xilitol, xilit, nyírfacukor |
| xylocaine {n} (lidocaine) SEE: lidocaine | :: |
| xylophone {n} (musical instrument) | :: xilofon |
| xylose {n} (wood sugar) | :: xilóz |