What does the root paleo mean?

The root "paleo" comes from the Greek word "παλαιός" (palaios), meaning "old" or "ancient".

It's often used in words related to:

* Ancient history and cultures: Paleontology, Paleolithic, Paleography

* Old or primitive forms: Paleobotany, Paleoanthropology, Paleoclimatology

* Things that are no longer in use: Paleotechnique, Paleoart

So, whenever you see "paleo" in a word, it usually signifies something related to the past or ancient times.