Entry 1 sense Webster, 1913 Paleobotany /pālˌ-ē-ōb-ät'-ən-ē/ · Pa·le·o·bot·a·ny · IPA /pˌeɪliːoʊbˈɑtəniː/ 01 n. That branch of paleontology which treats of fossil plants. 1. That branch of paleontology which treats of fossil plants.