polygenism

po·lyg·e·nism

[puh-lij-uh-niz-uhm]
noun
the theory that the human race has descended from two or more ancestral types.

Origin:
1875–80; poly- + -gen(y) + -ism

po·lyg·e·nist, noun, adjective
po·lyg·e·nis·tic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Polygenism is always a great word to know.
So is flibbertigibbet. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a chattering or flighty, light-headed person.
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