an act of throwing back.
a setback or check.
the reversion to an ancestral or earlier type or character; atavism.
an example of this.

1855–60; 1915–20 for def 3; noun use of verb phrase throw back Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
throwback (ˈθrəʊˌbæk)
1.  a.  a person, animal, or plant that has the characteristics of an earlier or more primitive type
 b.  a reversion to such an organism
vb (foll by on)
2.  (intr) to revert to an earlier or more primitive type
3.  to force to depend (on): the crisis threw her back on her faith in God

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"reversion to an ancestral type or character," 1888, from throw (v.) + back (adv.); earlier it meant "a reverse in a course or progress, a relapse" (1856).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No one could agree whether they were a distinct species, a throwback, or
  pathological individuals of our own species.
In some ways, self-paced online courses are a throwback to the days when
  learning at a distance meant corresponding by mail.
He is in many ways a throwback to the golden age of the gentleman explorer, one
  of the last of that peripatetic breed.
Slow-cookers are the perfect throwback gadgets for the busy modern chef.
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