IPA: //ˌpeɪliəʊˈbɒtənɪst//
KK: /ˈpeɪliəʊˌbɒtənɪst/
A scientist who studies ancient plants and their fossils to understand the history of plant life on Earth.
The paleobotanist discovered a new species of fern from the fossil record.
Paleobotanist → It is formed from "paleo-" (from Greek "palaios", meaning ancient) and "botanist" (from Greek "botanē", meaning plant, and "-ist", meaning one who practices or specializes in). The word refers to a specialist in ancient plants.
Think of 'ancient' ('paleo-') plants ('botanist') to remember that a paleobotanist studies ancient plant life.