| X-ray | radiografar |
| X-ray photo | Rádio |
| X-ray photoelectron spectroscopy | Espectroscopia de raios-X |
| X-ray photography | Rádio |
| X-ray picture | radiografia |
| X-ray vision | visão de raios-X |
| X-rays | raios X |
| X-wing | X-Wing |
| Xabi Alonso | Xabier Alonso Olano |
| Xacuti | Chacuti |
| Xagħra | Caça |
| Xai-Xai | Xai-Xai |
| Xaisomboun | Saysomboun |
| Xalapa | Xalapa |
| Xanadu | Xanadu |
| Xanadu House | Xanadu |
| Xanana Gusmão | Xanana Gusmão |
| Xandros | Xandros |
| Xanthi | Xanthi |
| Xanthi Prefecture | Xanthi |
| xanthine | xantina |
| Xanthippe | Xântipe |
| Xanthippus of Carthage | Xântipe |
| Xanthoceras | Xanthoceras |
| Xanthophyceae | Chrysophyta |
| Xanthos | Xantos e Bálios |
| Xanthosoma | Xanthosoma |
| Xantusiidae | Xantusiidae |
| Xaver | Javier |
| Xavi | Xavier Hernández Creus |
| Xavier | Xavier |
| Xavier Sala-i-Martin | Xavier Sala i Martín |
| Xavánte | xavante |
| XBoard | XBoard |
| Xbox Live Vision | Xbox Live Vision |
| XChat | X-Chat |
| XD-Picture Card | XD-Picture Card |
| XDR DRAM | XDR |
| Xe | Xenônio |
| Xekong Province | Sekong |
| Xen | Xen |
| Xena | Xena |
| Xenarthra | Xenarthra |
| Xenisthmidae | Xenisthmidae |
| Xenix | Xenix |
| Xenoglossy | Xenoglossia |
| Xenomorph | Xenomorfo |
| xenon | xenônio |
| Xenopeltidae | Xenopeltidae |
| Xenopeltis unicolor | Xenopeltidae |
| Xenophanes | Xenófanes de Cólofon |
| xenophobe | xenófobo |
| xenophobia | xenofobia |
| xenophobic | xenófobo |
| Xenophon | Xenofonte |
| Xenophon Zolotas | Xenofón Zolótas |
| Xenophontos monastery | Xenofonte |
| Xenosauridae | Xenosauridae |
| Xenotarsosaurus | Xenotarsosaurus |
| xenotransplantation | xenotransplante |
| Xenoturbella | Xenoturbella |
| Xeon | Xeon |
| Xeraco | Xeraco |
| Xeres | Circuito Permanente de Jerez |
| Xeresa | Xeresa |
| Xerez CD | Xerez Club Deportivo |
| Xermade | Xermade |
| Xero | Xero |
| Xerochrysum | Bracteantha |
| xerographic | xerográfico |
| xerography | xerografia |
| xerophthalmia | xeroftalmia |
| xerox | copiar |
