- xenonThe chemical element (symbol Xe) with an atomic number of 54. It is a colorless, odorless, unreactive noble gas, used notably in camera flash technology.
- xenophobicExhibiting or characterised by xenophobia, a fear or hatred of strangers, foreigners, or extraterrestrial life.
- pyroxeneAny of a group of crystalline minerals containing silicates of iron, magnesium and calcium.
- xenophobeOne who hates or fears strangers or foreigners.
- Sino-XenicRelated to pronunciations for reading Chinese in Japan, Korea and Vietnam, originating in medieval times and the source of large-scale borrowings of Chinese words into Japonic, Koreanic and Vietnamese languages, none of which are genetically related to Chinese (excluding Sinitic topolects).
- trogloxeneAny organism which sporadically lives in underground habitats such as caves, and cannot live there exclusively.
- xenacanthiformAny of the order †Xenacanthiformes of extinct shark-like chondrichthyans.
- xenarthranAny mammal of the superorder Xenarthra, of the Americas; an anteater, armadillo or sloth.
- xeno-Having to do with foreigners.
- xenogamyThe transfer of pollen from the anthers of one plant to the stigma of another; cross-pollination.
- xenylThe univalent radical derived from diphenyl.