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Answer for the clue "(chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst ", 12 letters:
anticatalyst

Word definitions for anticatalyst in dictionaries

Wiktionary Word definitions in Wiktionary
n. Any substance that inhibits the activity of a catalyst.

WordNet Word definitions in WordNet
n. (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst [ant: catalyst ]