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From The Collaborative International Dictionary of English v.0.48:
Nihilist \Ni"hil*ist\, n. [Cf. F. nihiliste. See Nihilism.] 1. One who advocates the doctrine of nihilism; one who believes or teaches that nothing can be known, or asserted to exist. [1913 Webster] 2. (Politics) A member of a secret association (esp. in Russia), which is devoted to the destruction of the present political, religious, and social institutions. [1913 Webster]