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Definition of: Cenozoic
(sē′nə·zō′ik, sen′ə-) adjective Geol.
Of or pertaining to the fourth and latest of the eras of geologic time, following the Mesozoic, and extending to and including the present. The Cenozoic rocks are customarily divided into the Tertiary and Quaternary (or Pleistocene) systems. See chart under GEOLOGY.
—noun The Cenozoic period: called also the age of mammals. Also spelled Caenozoic, Cainozoic. [<Gk. kainos new + zōē life]
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