from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A substance that chemically reduces other substances, especially by donating an electron or electrons.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any substance that reduces, or donates electrons to, another; in so doing, it becomes oxidized.
from the GNU version of the Collaborative International Dictionary of English
- n. a substance that causes reduction of another substance in a chemical reaction, as by donating electrons or adding hydrogen atoms.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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 loose silver
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