[az-oh, ey-zoh]

adjective Chemistry.

containing the azo group.

Nearby words

  1. azine,
  2. azine dye,
  3. azlocillin sodium,
  4. azlon,
  5. aznar,
  6. azo dye,
  7. azo group,
  8. azo-,
  9. azobenzene,
  10. azof

Origin of azo

First recorded in 1875–80; independent use of azo-


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 of azo-

< Greek ázō(os) without life, equivalent to a- a-6 + zō- zo- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for azo

British Dictionary definitions for azo



of, consisting of, or containing the divalent group -N:N-an azo group or radical See also diazo

Word Origin for azo

independent use of azo-


before a vowel az-

combining form

indicating the presence of an azo groupazobenzene

Word Origin for azo-

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

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

Medicine definitions for azo



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.

Science definitions for azo


[ăzō, āzō]

Containing two nitrogen atoms joined by a double bond, with each nitrogen atom attached to another group.



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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.