catalyst









catalyst


noun

  1. Chemistry. a substance that causes or accelerates a chemical reaction without itself being affected.
  2. something that causes activity between two or more persons or forces without itself being affected.
  3. a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution.
  4. a person whose talk, enthusiasm, or energy causes others to be more friendly, enthusiastic, or energetic.

noun

  1. a substance that increases the rate of a chemical reaction without itself suffering any permanent chemical changeCompare inhibitor (def. 2)
  2. a person or thing that causes a change
n.

“substance which speeds a chemical reaction but itself remains unchanged,” 1902, formed in English (on analogy of analyst) from catalysis. Figurative use by 1943.

n.

  1. A substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process.

  1. A substance that starts or speeds up a chemical reaction while undergoing no permanent change itself. The enzymes in saliva, for example, are catalysts in digestion.

In chemistry, a substance that causes a chemical reaction to occur but is not itself involved in the reaction.

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