noun Informal.

amm(unition) + -o Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
ammo (ˈæməʊ)
informal short for ammunition

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1917; see ammunition.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
When some crackpot snaps and goes to campus with a sackful of guns and ammo,
  they are the next thing to invulnerable.
Heavy machine guns and other similar weapons have depleted uranium ammo
Wrong if they thought that magic bullets would fall out of an equally magical
  box of ammo against disease.
More ammo for my thoughts that musical appreciation is learned, not innate.
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