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polygenesis
CIDE DICTIONARY
polygenesis, n. [Poly- + genesis, or root of Gr. gi`gnesqai to be born.].
The theory that living organisms originate in cells or embryos of different kinds, instead of coming from a single cell; -- opposed to monogenesis . [1913 Webster]
OXFORD DICTIONARY
polygenesis, n. the (usu. postulated) origination of a race or species from several independent stocks.
Derivative
polygenetic adj.
For further exploring for "polygenesis" in Webster Dictionary Online
