oxidizer

[ok-si-dahy-zer]
noun Chemistry.

Origin:
1870–75; oxidize + -er1

antioxidizer, noun
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Collins
World English Dictionary
oxidizer or oxidiser (ˈɒksɪˌdaɪzə)
 
n
an oxidant, esp a substance that combines with the fuel in a rocket engine
 
oxidiser or oxidiser
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

oxidizer
1875, from oxidize.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

oxidizer ox·i·diz·er (ŏk'sĭ-dī'zər)
n.
A substance that oxidizes another substance; an oxidizing agent. Also called oxidant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
All pyrotechnic mixtures are made up of a fuel and an oxidizer.
AE: the only large scale use of perchlorate is as an oxidizer for solid
  propellants.
When rockets blast off, they need to carry not only fuel, but an oxidizer to
  ignite the fuel.
It also happens to be what bomb specialists call an oxidizer.
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