Ord der begynder med X som er valideret

• xenopus — Navneord – Engelsk ～ an African clawed frog; in some classifications made the type genus of a separate family Xenopodidae
• Xenorhyncus — Navneord – Engelsk ～ East Indian and Australian storks
• Xenorhyncus asiaticus — Navneord – Engelsk ～ large mostly white Australian stork
• Xenosauridae — Navneord – Engelsk ～ monotypic family of Mexican lizards
• Xenosaurus — Navneord – Engelsk ～ type and sole genus of Xenosauridae: slender-bodied Mexican lizards having the upper surface covered with tiny granules and tubercles
• xenotime — Navneord – Engelsk ～ a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form
• xenotransplant — Navneord – Engelsk ～ a surgical procedure in which tissue or whole organs are transfered from one species to another species
• xenotransplantation — Navneord – Engelsk ～ a surgical procedure in which tissue or whole organs are transfered from one species to another species
• xeranthemum — Navneord – Engelsk ～ any plant of the genus Xeranthemum native to southern Europe having chaffy or silvery flower heads with purplish tubular flowers
• Xeranthemum annuum — Navneord – Engelsk ～ mostly widely cultivated species of everlasting flowers having usually purple flowers; southern Europe to Iran; naturalized elsewhere
• xeric — Tillægsord – Engelsk ～ being deficient in moisture; "deserts provide xeric environments"
• Xerobates — Navneord – Engelsk ～ possible new genus for desert and Texas tortoises based on recent research
• xeroderma pigmentosum — Navneord – Engelsk ～ a rare genetic condition characterized by an eruption of exposed skin occurring in childhood and photosensitivity with severe sunburn; inherited as a recessive autosomal trait in which DNA repair processes are defective so they are more likely to chromosome breaks and cancers when exposed to ultraviolet light
• xeroderma — Navneord – Engelsk ～ a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin
• xerodermia — Navneord – Engelsk ～ a mild form of ichthyosis characterized by abnormal dryness and roughness of the skin
• xerographic copier — Navneord – Engelsk ～ a duplicator (trade mark Xerox) that copies graphic matter by the action of light on an electrically charged photoconductive insulating surface in which the latent image is developed with a resinous powder
• xerographic printer — Navneord – Engelsk ～ a page printer that uses the xerographic process
• xerographic — Tillægsord – Engelsk ～ of or relating to xerography
• xerography — Navneord – Engelsk ～ forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas; "edge enhancement is intrinsic in xerography"
• xeroma — Navneord – Engelsk ～ abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A

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