a chemical agent that oxidizes.
Also called oxidizer, oxidizing agent.

1880–85; oxide + -ant

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World English Dictionary
oxidant (ˈɒksɪdənt)
Also called (esp in rocketry): oxidizer a substance that acts or is used as an oxidizing agent

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

1884, from Fr. oxidant (1806), from oxider (see oxidation).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

oxidant ox·i·dant (ŏk'sĭ-dənt)
See oxidizer.

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
Hydrogen peroxide is a potent oxidant and antiseptic that rapidly destroys living matter.
It thus needs to carry less fuel than a rocket, and no chemical oxidant to burn that fuel, as a rocket would.
And yes, early detection would be key to starting on a spectrum of anti-oxidant regimen before damage accrues.
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