\A*zo"ic\, a. [Gr. 'a priv. + ? life, from ? to live.]
Destitute of any vestige of organic life, or at least of
animal life; anterior to the existence of animal life; formed
when there was no animal life on the globe; as, the azoic.
rocks.
{Azoic age} (Geol.), the age preceding the existence of
   animal life, or anterior to the paleozoic tome. Azoic is
   also used as a noun, age being understood. See
   {Arch[ae]an}, and {Eozoic}.