chimera

noun
chi·​me·​ra | \ kī-ˈmir-ə How to pronounce chimera (audio) , kə-\

Definition of chimera

1a capitalized : a fire-breathing she-monster in Greek mythology having a lion's head, a goat's body, and a serpent's tail
b : an imaginary monster compounded of incongruous parts
2 : an illusion or fabrication of the mind especially : an unrealizable dream a fancy, a chimera in my brain, troubles me in my prayer — John Donne His utopia was a chimera.
3 : an individual, organ, or part consisting of tissues of diverse genetic constitution A hybrid created through fusion of a sperm and an egg from different species is a chimera.