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Anticatalyst
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The American Heritage® Dictionary of the English Language, 4th Edition
n.
A substance that retards or arrests a chemical reaction.
n.
A substance that reduces or destroys the effectiveness of a catalyst.
Wiktionary, Creative Commons Attribution/Share-Alike License
n.
Any substance that inhibits the activity of a catalyst.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n.
(chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst
Word Usage
"Their engines are feeble; the fireproofing anticatalyst for the hydrogen is experimental. ""
Hypernym
Words that are more generic or abstract
inhibitor
Unknown
anticapitalist