Ce·no·zo·ic /ˌsinəˈzoɪk, ˌsɛ-/
Ce·no·zo·ic a. Geol. Belonging to the most recent division of geological time, including the tertiary, or Age of mammals, and the Quaternary, or Age of man. [Written also cænozoic, cainozoic, kainozoic.] See Geology.
Note: ☞ This word is used by many authors as synonymous with Tertiary, the Quaternary Age not being included.
n : approximately the last 63 million years [syn: Cenozoic era,
Age of Mammals]