chimaerism

/kaɪˈmɪrɪzəm/
noun
  1. A condition in which an organism has two or more genetically different sets of cells, often resulting from the fusion of embryos or from transplantation.
    • The doctor explained that chimaerism can occur naturally in humans when twins fuse early in development.
    • The patient's chimaerism was discovered after a routine blood test showed two distinct DNA profiles.
    • Scientists study chimaerism in animals to understand how different cell types can coexist in one body.
  2. A fanciful or impossible idea; a fantasy or illusion.
    • She warned that chasing such a dream was just chimaerism, not a realistic goal.
    • The novel explores the chimaerism of a world without conflict.
    • His plan to build a city on Mars was dismissed as pure chimaerism.
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