[1] : The Collaborative International Dictionary of English v.0.48

cenozoic \ce`nozo"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 caenozoic,
   cainozoic, kainozoic. see geology.
   1913 webster

   note: this word is used by many authors as synonymous with
         tertiary, the quaternary age not being included.
         1913 webster
see also:
caenozoic cainozoic kainozoic geology 

[2] : WordNet (r) 2.0

cenozoic
     n : approximately the last 63 million years syn: cenozoic era,
          age of mammals
see also:
cenozoic era age of mammals 

Cenozoic >> C Words
Cenozoic, definition of term: Cenozoic
cenozoic_pag1.html