azo-

1.
a combining form used in the formation of compound words, especially names of chemical compounds containing nitrogen or the azo group:
azobenzene.
Also, especially before a vowel, az-.
Origin
< Greek ázō(os) without life, equivalent to a- a-6 + zō- zo-
British Dictionary definitions for azo-

azo-

combining form
1.
indicating the presence of an azo group: azobenzene
Word Origin
from French azote nitrogen, from Greek azōos lifeless, from a-1 + zōē life
Word Origin and History for azo-

word-forming element denoting the presence of nitrogen, 1879, from comb. form of azote, the old term for "nitrogen" (from Greek a- "not, without" (see a- (3)) + zoion "a living being;" see zoo); coined in French by Lavoisier & de Morveau because living things cannot survive in the gas.

azo- in Medicine

azo- or az-
pref.
Containing a nitrogen group, especially one attached at both ends in a covalent bond to other groups: azole.

azo- in Science
azo- or az-  
A prefix that means "containing an azo group attached at both ends to other groups," as in the compound azobenzene.