archaeozoic

• POS: Adjective, Noun
• HYPHEN: Ar=chae=o=zo=ic

CIDE DICTIONARY

archaeozoic, a. [Gr. 'archai^os ancient + zw^,on animal.].

•  Like or belonging to the earliest forms of animal life.  [1913 Webster]
•  formed in or belonging to the earlier of two divisions of the Precambrian era.  [WordNet 1.5]

archaeozoic, n. [Gr. 'archai^os ancient + zw^,on animal.].

 the time from 1.5 billion to 5 billion years ago; the time when the earth's crust formed; a time when only unicellular organisms and the earliest forms of life are present.  [WordNet 1.5]