a. [ Gr. 'a priv. + &unr_; life, from &unr_; 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. [ 1913 Webster ]

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 Archæan, and Eozoic. [ 1913 Webster ]