Having characteristics regressing to a more primitive type; resembling a distant ancestor. A evolutionary throwback.
The atavistic dew claw in many dog breeds is a simple example of a genetic throwback to an earler stage of dog evolution.

An atavistic example in humans is when babies are born with true tails.

by OneBadAsp November 02, 2006
A pro gamer who never looks like one.
I am an atavistic.:-D
by Tirumarai February 20, 2006

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