pa·le·on·tol·o·gy (pā'lē-ŏn-tŏl'ə-jē) n. The study of the forms of life existing in prehistoric or geologic times, as represented by the fossils of plants, animals, and other organisms. pa'le·on'to·log'ic (-ŏn'tə-lŏj'ĭk), pa'le·on'to·log'i·cal (-ĭ-kəl) adj., pa'le·on·tol'o·gist n.
1838 (Lyell), probably from Fr. paléontologie, from Gk. palaios "old, ancient" (see paleo-) + on (gen. ontos) "being" + -ology "study of." Paleontologist formed in Eng. 1871.