Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A substance that retards or arrests a chemical reaction.
  • noun A substance that reduces or destroys the effectiveness of a catalyst.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any substance that inhibits the activity of a catalyst.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

anti- +‎ catalyst

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Examples

  • Their engines are feeble; the fireproofing anticatalyst for the hydrogen is experimental. "

    There Will Be Time Anderson, Poul, 1926-2001 1972

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