Ce•no•zo•icPronunciation: (sē"nu-zō'ik, sen"u-), [key] Geol.
noting or pertaining to the present era, beginning 65 million years ago and characterized by the ascendancy of mammals. See table under geologic time.
the Cenozoic Era or group of systems. Also,Cainozoic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.