| xanthenic {adj} (pertaining to, or derived from xanthene) | :: xantenico |
| xanthine {n} (group of alkaloids, including caffeine) | :: xantina {f} |
| Xanthippe {n} /zænˈθɪpiː/ (ill-tempered woman) | :: Santippe |
| xanthogenate {n} (xanthate) | :: xantogenato {m} |
| xanthomous {adj} (of or pertaining to a xanthoma) | :: xantomatoso |
| Xavier {prop} /ˈzeɪ.vjɚ/ (male given name) | :: Saverio |
| xebec {n} /ˈziːbɛk/ (transport ship) | :: sciabecco {m} |
| xenacanthid {n} (Any prehistoric shark of the family Xenacanthidae.) | :: xenacantido {m} |
| xenarthran {n} (mammal) | :: xenartro {m} |
| xenobiont {n} (biology: organism found in surroundings, or in association with another organism, in which it is normally absent) | :: xenobio {m}, xenobionte {m} |
| xenobiotic {adj} (of or pertaining to xenobiosis) | :: xenobiotico |
| xenocide {n} /ˈzɛnəsaɪd/ (genocide of entire alien species) | :: xenocidio {m} |
| Xenocrates {prop} (philosopher) | :: Senocrate {m} |
| xenodochium {n} /ˌzɛn.oʊˈdoʊ.ki.əm/ (room in a monastery) | :: xenodochio {m} |
| xenoglossy {n} /ˌziːnəˈɡlɒsi/ (knowledge of a language one has never learned) | :: xenoglossia {f} |
| xenolith {n} (geology: any piece of rock having a different origin to that of the igneous rock in which it is found) | :: xenolite {m} |
| xenon {n} /zinən/ (chemical element) | :: xenon {m}, xeno {m} |
| Xenophanes {prop} /zɛˈnɒfəniːz/ (a Greek philosopher and a poet) | :: Senofane |
| xenophilia {n} (attraction or love for foreign people, manners or culture) | :: esterofilia {f} |
| xenophobe {n} /ˈzinəfoʊb/ (hater of foreigners) | :: xenofobo {m}, xenofoba {f} |
| xenophobia {n} /zinəˈfoʊbiə/ (a pathological fear or hatred of strangers or foreigners) | :: xenofobia {f} |
| xenophobic {n} (xenophobe) SEE: xenophobe | :: |
| xenophobic {adj} (exhibiting or characterised by xenophobia) | :: xenofobo |
| Xenophon {prop} (historian and philosopher) | :: Senofonte {m} |
| xenotime {n} (a yellow-brown mineral) | :: xenotima {f} |
| xenotransplantation {n} (transplantation between species) | :: xenotrapianto {m} |
| xero- {prefix} (dryness) | :: xero- |
| xeroderma {n} (pathology: any of various skin diseases characterised by dry hard scaly skin) | :: xeroderma {m} |
| xerophthalmia {n} (condition) | :: xeroftalmia {f} |
| xerophthalmic {adj} (of or pertaining to xerophthalmia) | :: xeroftalmico |
| xerophyte {n} /ˈzɪəɹəʊfaɪt/ (botany: a plant suited for life in a habitat where water is scarce) | :: xerobio {m}, xerofita {f} |
| xeroradiography {n} (method of X-ray photography) | :: xeroradiografia {f} |
| xerostomia {n} (dry mouth) SEE: dry mouth | :: |
| xerox {v} /ˈziː(ə)ɹ.ɑks/ (to make photocopies) | :: fotocopiare, xerocopiare |
| Xerxes {prop} /ˈzɝksiːz/ (Xerxes I of Persia) | :: Serse {m} |
| Xhosa {n} /ˈkoʊ.sə/ (Xhosa language) | :: xhosa {m} |
| xi {n} /ksaɪ/ (Greek letter) | :: xi {m} {f}, csi {m} {f}, ksi {m} {f} |
| Xianggang {prop} (Hong Kong) SEE: Hong Kong | :: |
| xiphias {n} (xiphias) SEE: swordfish | :: |
| xiphoid {adj} /ˈzɪfɔɪd/ (of or relating to the xiphisternum) | :: xifoide |
| xiphosauran {n} (chelicerate) | :: xifosuro {m} |
| Xizang {prop} (Tibet) SEE: Tibet | :: |
| xoanon {n} /ˈzoʊ.ə.nɑn/ (wooden statue used as a cult image in Ancient Greece) | :: xoanon {m} |
| X-ray {n} /ˈɛks ˌɹeɪ/ (photograph made with X-rays) | :: radiografia {f} |
| X-ray {n} (the letter "X" in ICAO spelling alphabet) | :: xeres |
| X-ray {v} (to take a radiograph of) | :: radiografare, schermografare |
| X-ray {adj} (of or having to do with X-rays) | :: radiografico |
| xylan {n} (biochemistry: a polysaccharide consisting of xylose residues) | :: xylano {m}, xilano {m} |
| xylanase {n} (any of various enzymes) | :: xilanasi {f} |
| xylem {n} /ˈzaɪ.ləm/ (botany: vascular tissue in land plants) | :: xilema {m} |
| xylene {n} /ˈzaɪliːn/ (di-methyl-benzene) | :: xilene {m} |
| xylo- {prefix} (wood) | :: xilo- |
| xylograph {n} (engraving in wood) SEE: woodcut | :: |
| xylograph {n} (print taken from an engraving in wood) SEE: woodcut | :: |
| xylography {n} (art of making xylographs) SEE: woodcut | :: |
| xylolite {n} (A compressed wood product used for flooring) | :: xilolite {f} |
| xylophone {n} /ˈzaɪ.lə.ˌfəʊn/ (musical instrument) | :: xilofono {m} |
| xylose {n} (wood sugar) | :: xilosio {m} |