A-zō'ic, a.

a. [Gr. ἀ priv. and ζωή, life, from ζάειν, ζῆν, 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. Dana.

Azoic age (Geol.), the age preceding the existence of animal life, or anterior to the Silurian. The term azoic is also used as a noun, age being understood. Dana.