atavist

[at-uh-viz-uhm]

at·a·vism

[at-uh-viz-uhm]
noun
1.
Biology.
a.
the reappearance in an individual of characteristics of some remote ancestor that have been absent in intervening generations.
b.
an individual embodying such a reversion.
2.
reversion to an earlier type; throwback.

Origin:
1825–35; < Latin atav(us) remote ancestor (at-, akin to atta familiar name for a grandfather + avus grandfather, forefather) + -ism

at·a·vist, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Atavist is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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