azo-, az- +

(Greek: without life; nitrogen)

Coined by the French chemist Antoine-Laurent de Lavoisier [1743-94] in 1776, so called by him because this element is incapable of supporting life.
An abnormally low glycogen content of the liver as a result of metabolic dysfunction.
A colored compound having derivatives that are used as dyestuffs.
Any of several red or bluish red acid dyes that are used in compound stains; especially, for microscopic examination of connective tissue.
azoic (adjective), more azoic, most azoic
A reference to being devoid of living organisms; without life: Biologists talk about an azoic time when our Earth existed without any life on it.

Specifically, designating the Early Precambrian ("Archean") era, before life appeared on earth because the azoic rocks did not contain any signs of organic remains.

A member of a class of five-membered heterocyclic organic compounds that contain nitrogen atoms and two double bonds.
The nitrogen-containing colored compound primarily responsible for the indicator properties of litmus.