Panspermist n. : A believer in panspermy; one who rejects the theory of spontaneous generation; a biogenist.

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Defination from the web:
panspermist. Plural. panspermists. panspermist (plural panspermists) An advocate of panspermism; one who believes that life on Earth originated in outer space. ... Retrieved from "http://en.wiktionary.org/wiki/panspermist" Category: English nouns. Views. Entry. Discussion. Edit ...