WordReference Random House Unabridged Dictionary of American English © 2017
reducing a′gent, [Chem.]
  1. Chemistrya substance that causes another substance to undergo reduction and that is oxidized in the process.
  • 1795–1805

Collins Concise English Dictionary © HarperCollins Publishers::

reducing agent n
  1. a substance that reduces another substance in a chemical reaction, being itself oxidized in the process

'reducing agent' also found in these entries:

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