prehistoric
adj.adj. relating to the very long period of time before people started writing down history. It describes things from the era of dinosaurs or early humans.
adj. relating to or existing in the period before written records. Often used to describe geological eras or early human civilizations.
The museum has a large collection of prehistoric tools.
Archaeologists discovered prehistoric cave paintings that show how early humans hunted large animals.
The discovery of prehistoric remains in the melting glacier provided scientists with unprecedented data regarding the diet and health of humans living thousands of years ago.
From pre- (“before”) + historic, q.v., similar to slightly earlier ante-historic.
Typically used attributively before a noun. Can be used figuratively to describe something extremely old-fashioned or out of date.