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a combining form used in the formation of compound words, especially names of chemical compounds containing nitrogen or the azo group:
Also, especially before a vowel, az-.
Origin of azo-
< Greek ázō(os) without life, equivalent to a- a-6 + zō- zo- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for azo-


combining form
indicating the presence of an azo group: azobenzene
Word Origin
from French azote nitrogen, from Greek azōos lifeless, from a-1 + zōē life
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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azo- in Medicine

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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