atavistic
/æt.əˈvɪs.tɪk/
/æt.əˈvɪs.tɪk/
adjective
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Of the recurrence of a trait reappearing after an absence of one or more generations due to a chance recombination of genes.
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Of a throwback or exhibiting primitivism.
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Relating to earlier, more primitive behavior that returns after an absence.
Synonyms:
atavistical