Catalyst: nm (word coming from the English catalysis; from the Greek katalusis: "dissolution").
In chemistry, a catalyst is a substance which, in minute quantities compared to that of reactants, causes catalysis (modification and above all acceleration of a chemical reaction under the effect of a substance).
Catalyst of biochemical reactions (biocatalyst).
Metallic, enzymatic catalysts.
Activators, poisons of a catalyst.
Figurative meaning: What triggers a reaction by its very...
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