Is “Atavism” a Scrabble word?
Yes
ATAVISM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Atavism
/ˈætəˌvɪzəm/
noun
1.The reappearance of an ancestral characteristic in an organism after several generations of absence.
2.The recurrence or reversion to a past behaviour, method, characteristic or style after a long period of absence.
3.Reversion to past primitive behavior, especially violence.