Definition of truther
: one who believes that the truth about an important subject or event is being concealed from the public by a powerful conspiracy He isn't a 9/11 truther, as some erroneously allege, but he has his fair share of “out there” beliefs. — Felix Blederman But it is not flattering to be called a “truther.” The term originated, as far as anyone can tell, to characterize people who embraced alternative explanations for the Sept. 11 attacks. — Mark Leibovich
First Known Use of truther
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