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[2] Relating to old or established pattern; habitual, ingrained [3] (as a noun) an atavist is a genetic characteristic emerging after absence from several generations (see Wikipedia entry for a more detailed explanation).— Griffin And Hoxie Mega Feed
These observations suggest that the primordial IMPDH used the Thr321 pathway exclusively, and elimination of the Arg418 pathway by mutation of modern IMPDH creates an enzymatic atavist.— PLoS Biology: New Articles
But Jesse Helms was so rooted in his atavist traditions, he chose to remain true to his misogyny rather than pose for cameras with faux female golfing partners.— NewsBusters.org - Exposing Liberal Media Bias
Of two hundred seeds one became a blue atavist, or rather vicinist, while all others remained true to the white type.— Species and Varieties, Their Origin by Mutation
He could be an atavist, a victim of unconscious regression.— Strange Alliance

Century Dictionary (1)
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