| 21120 | X Alphabetical Letter | |
| 19512 | X (SIPHOVIRIDAE) | |
| 8907 | X.Y.S. LYNDON HARRIS | |
| 15074 | XANTHELASMA | |
| 10606 | XANTHINE DEHYDROGENASE | |
| 1739 | XANTHINE OXIDASE | |
| 755 | XANTHINUM (Xanthine) | |
| 25571 | XANTHIUM AMERICANUM | (Cocklebur) |
| 4459 | XANTHIUM SPINOSUM | |
| 12503 | XANTHIUM STRUMARIUM see ROUGH COCKLEBU | R (Xanthium Strumarium) Herb |
| 18359 | XANTHOGRANULOMA TUMOUR | |
| 12344 | XANTHORREA ARBOREA | |
| 11936 | XANTHORREA PREISSI see BLACKBOY | |
| 4460 | XANTHORRHIZA APIFOLIA | |
| 4458 | XANTHORRHOEA ARBORESCENS see AUSTRALIA | N GRASS TREE Xanthorrhoea Arbores)Herb |
| 12002 | XANTHOSIA ROTUNDIFLORA A.F.E. see | ` SOUTHERN CROSS - A.F.E. |
| 1833 | XANTHOXYLUM FRAXINEUM | |
| 27799 | XANTHROPHYLL | |
| 19600 | XANTHUS MYXOCCOCUS | |
| 5496 | X-CHROMOSOME | |
| 16621 | XENOCOCCUS Bacteria | |
| 19725 | XENOGENIC TISSUE | |
| 3583 | XENON | |
| 10608 | XENON 133 | |
| 15627 | XENOPSYLLA (Common Rat Flea) | |
| 28360 | XENOPUS GILLI | FROG |
| 7684 | XENOPUS LAEVIS | |
| 18477 | XENORHABDUS Bacteria | |
| 12103 | XERANTHEMUM F.E. | |
| 7357 | XERODERMA PIGMENTOSUM | |
| 7834 | XERODERMOSTEOSIS (SJOGENS SYNDROME) | |
| 3937 | XEROPHYLLUM TENAX | |
| 5094 | XEROSIS | |
| 18531 | XF (INOVIRIDAE) Virus | |
| 17974 | Xf2 (INOVIRIDAE) | |
| 24470 | XIANG SHA LIU JUN ZI WAN | |
| 9031 | xiaochtng [Small intestine] | |
| 25363 | XIE: ALL FORMS | |
| 9615 | xi-huo [evil fire] | |
| 8251 | xin [Viscera - Heart] | |
| 9652 | xin sh+n bÑ jiao [heart and | ` kidney not communicating] |
| 8256 | xinbao;xinbaolu [Vis.-Pericardium] | |
| 9644 | xinhuo n+ich( [flaming of | ` the fire of the heart] |
| 9643 | xinhuo shOngytn [flaring up | ` of the fire of the heart] |
| 18822 | XINJIANGENSIS Bacteria | |
| 8261 | xiOjiao [Bowel - Lower burner] | |
| 4373 | XIPHOSURA see LIMULUS | |
| 20699 | XONOTLITE G.E. | |
| 18578 | XP5 Virus | |
| 412 | X-RAY | |