The Collaborative International Dictionary
caenozoic
Cenozoic \Ce`no*zo"ic\, a. [Gr. ? recent + ? life.] (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 c[ae]nozoic, cainozoic, kainozoic.] See Geology.
Note: This word is used by many authors as synonymous with Tertiary, the Quaternary Age not being included.
Wiktionary
caenozoic
a. (alternative form of Cenozoic English) n. (alternative form of Cenozoic English)