P0021800 (pā′lē-ō-bŏt′n-ē)n. The branch of paleontology that deals with plant fossils and ancient vegetation.pa′le·o·bo·tan′ic(-bə-tăn′ĭk), pa′le·o·bo·tan′i·cal(-ĭ-kəl) adj.pa′le·o·bo·tan′i·cal·ly adv.pa′le·o·bot′a·nist n. EncyclopediaSeePaleobotanyMedicalSeepalaeobotany