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Definition of: polyphylesis
(pol′i·fī·lē′sis) noun Biol.
The separate and distinct origin of a species of plants or animals from more than one line of descent. Also pol·y·phy·ly (pol′i·fī′lē). [<NL <Gk. polyphylos of many tribes <poly- many + phylē a clan]
—pol′y·phy·let′ic (-let′ik) adjective
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