| xenogenesis | (noun) the alternation of two or more different forms in the life cycle of a plant or animal | Synonyms: alternation of generations, heterogenesis |
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| xenograft | (noun) tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species | Synonyms: heterograft |
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| xenolith | (noun) (geology) a piece of rock of different origin from the igneous rock in which it is embedded | - |
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| xenon | (noun) a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts | Synonyms: atomic number 54, Xe |
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| xenophobia | (noun) a fear of foreigners or strangers | - |
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| xenotime | (noun) a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form | - |
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| xenotransplant | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplantation |
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| xenotransplantation | (noun) a surgical procedure in which tissue or whole organs are transferred from one species to another species | Synonyms: xenotransplant |
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