noun
a person after whom a discovery, invention, place, etc., is named or thought to be named
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The medical condition Parkinson's disease is named after its eponym, Dr. James Parkinson.
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Did you know that the sandwich is an eponym named after the Earl of Sandwich?
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I heard that the term 'boycott' is actually an eponym from a guy named Captain Charles Boycott.
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The term 'mentor' is often used as an eponym for someone who guides and teaches others.