Atavistic is an adjective that means related to something ancient.
The Latin word atavus (AH tah voos) means forefather and atavus could be considered the forefather of our word of the day. When we describe something as atavistic, we’re usually not referring to a specific forefather or ancestor, but more generally, to something ancient.
As an archeologist, I love finding ancient civilizations. It’s such a joy to be surrounded by atavistic artifacts.