Atavistic Definition
 ătə-vĭstĭk 
    adjective
  
 (biology) Of the recurrence of a trait reappearing after an absence of one or more generations due to a chance recombination of genes.
 Wiktionary 
Of a throwback or exhibiting primitivism.
Wiktionary 
Relating to earlier, more primitive behavior that returns after an absence.
 Wiktionary 
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