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From: Webster's Revised Unabridged Dictionary (1913)

 A·zo·ic a.  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 Archæan, and Eozoic.
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