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Reducing agent | reductant | reducer. the element or compound in an oxidation-reduction reaction that donates an electron to another species. Because the reducing agent is losing electrons, we say it has been oxidized.
â¢ REDUCING AGENT (noun) The noun REDUCING AGENT has 1 sense: 1. a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the slackened silver. Familiarity information: REDUCING AGENT used as a noun is very rare. Dictionary entry details.