/ ɪˈpɒnɪməs; NAmE ɪˈpɑːn-/ adjective
[ only before noun ] the eponymous character of a book, play, film / movie, etc. is the one mentioned in the title :
Don Quixote, eponymous hero of the great novel by Cervantes
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WORD ORIGIN
mid 19th cent.: from eponym + -ous .