reducing agent

noun Chemistry.
a substance that causes another substance to undergo reduction and that is oxidized in the process.

Origin:
1795–1805

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Collins
World English Dictionary
reducing agent
 
n
chem Compare oxidizing agent a substance that reduces another substance in a chemical reaction, being itself oxidized in the process

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

reducing agent n.
A substance that chemically reduces other substances, especially by donating an electron or electrons.

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
Well, sodium hydride is an example of a powerful reducing agent.
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