atavic

atavic

[uh-tav-ik]
adjective

Origin:
1865–70; atav(ism) + ic, modeled on French atavique

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World English Dictionary
atavism (ˈætəˌvɪzəm)
 
n
1.  the recurrence in a plant or animal of certain primitive characteristics that were present in an ancestor but have not occurred in intermediate generations
2.  reversion to a former or more primitive type
 
[C19: from French atavisme, from Latin atavus strictly: great-grandfather's grandfather, probably from atta daddy + avus grandfather]
 
'atavist
 
n
 
atavic
 
adj

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