- xanthomatosis
- xanthopathy
- xanthomonas
- xanthophyceae
- xanthopia
- xanthophyll
- xanthophyl
- xanthopsia
- xanthorrhoeaceae
- xanthorroea
- xanthosis
- xanthosoma sagittifolium
- xc
- xci
- xcii
- xciii
- xciv
- xcl
- xcvii
- xcviii
- xe
- xenagogy
- xenicidae
- xenogeneic
- xenolith
- xenomaniac
- xenomorph
- xenophobia
- xenotransplantation
- xeric
- xerodermia
- xerography
- xerophthalmus
- xerophile
- xerophytic
- xerophytism
- xeroradiography
- xerotripsis
- xerox machine
- xiii
- xinjiang
- xinjiang uighur autonomous region
- xiphioid
- xiphoid process
- xiphosurus polyphemus
- XLII
- XLVII
- xv
- xxii
- xxvii