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X (drug caution code) X (in genetics) X chromosome X chromosome inactivation X inactivation X, factor X-linked X-linked juvenile retinoschisis X-linked retinoschisis X-ray X-ray crystallography X-ray, AP X-ray, lateral X-ray, PA X-rays during pregnancy Xanax Xanth- (prefix) Xanthelasma Xanthine Xanthinuria Xanthoma Xanthoma tendinosum Xanthoma tuberosum Xanthoma, diabetic Xanthoma, disseminatum Xanthoma, eruptive Xanthoma, planar Xanthomatosis Xanthopsia Xanthosis Xen- (prefix) Xeno- (prefix) Xenoantigen Xenobiotic Xenograft Xenotransplantation Xenotropic virus Xeric Xero- Xeroderma Xeroderma pigmentosum Xerogram Xeromammography Xerophagia Xerophthalmia Xeroradiograph Xeroradiography Xerosis Xerostomia Xiphoid process

XP XRT XTC Xuezhikang XX XX gonadal dysgenesis with sensorineural deafness XX male syndrome XXX syndrome XXXX syndrome XXXXX syndrome XXY XY Xylitol XYY XYY syndrome