of, pertaining to, or characterized by atavism; reverting to or suggesting the characteristics of a remote ancestor or primitive type.

1870–75; atav(ism) + -istic

atavistically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atavistic (ˌætəˈvɪstɪk)
of or relating to reversion to a former or more primitive type

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
atavistic   (āt'ə-vĭs'tĭk)  Pronunciation Key 
Relating to an inherited trait that reappears in an individual after being absent from a strain of organism for several generations. Atavistic traits were formerly thought to be throwbacks to ancestral types but are now known to be due to the inheritance of a pair of recessive genes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The first of his great masterpieces, the building foreshadows the atavistic
  landmarks of his late career.
There is a far more atavistic element playing out in this war as well.
It's atavistic to cling to outmoded methods, but only when the new is actually
In evolutionary biology, it can signal an atavistic throwback to an ancestral
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