IPA: /ˌpeɪliənˈtɒlədʒɪst/
KK: /peɪlɪənˈtɑlədʒɪst/
A person who studies the history of life on Earth through the examination of fossils.
The paleontologist discovered a new species of dinosaur during the excavation.
Paleontologist → It is formed from "paleo-" (from Greek "palaios", meaning ancient) and "ont" (from Greek "ontos", meaning being or creature) and "-logist" (from Greek "logia", meaning study). The word refers to a person who studies ancient beings or creatures, particularly those that are fossilized.
Think of 'ancient' ('paleo-') creatures ('ont') being studied ('-logist') — that's what a paleontologist does.