Definizione monolingua

catalyst

catalyst (plural catalysts)

1. (chemistry) A substance that increases the rate of a chemical reaction without being consumed in the process.
   • 1988, Lubert Stryer Biochemistry, 3rd edition, page 177

     Enzymes, the catalysts of biological systems, are remarkable molecular devices that determine the pattern of chemical transformations.

2. Someone or something that encourages progress or change.

   Economic development and integration are working as a catalyst for peace.

   • 1978, Ernest George Schwiebert, Trout, Volume 2

     It was a morning baptized by my first cup of coffee, freshly brewed over a gravel-bar fire, while they celebrated with the stronger catalyst of sour-mash whiskey in their fishing-vest cups.

   • 2004, Michael B. Oren, Six Days of War: June 1967 and the making of the modern Middle East, page 76

     Israels fear for the reactor—rather than Egypts of it—was the greater catalyst for war.

   • 2006, The Freedom Writers, with Erin Gruwell, The Freedom Writers Diary: How a Teacher and 150 Teens Used Writing to Change Themselves and the World Around Them, Diary 74

     Rosa Parks was a true catalyst for change and she was only one person. Hearing about Rosa Parks and her protest showed me that there is hope for me and all the students in Ms. Gs classes to truly be catalysts for change.

3. (automotive) A catalytic converter.

Definizione dizionario catalyst

	catalizzatore
	someone or something that helps or encourages progress or change
	substance which increases the rate of a chemical reaction without being consumed in the process
	A substance whose presence alters the rate at which a chemical reaction proceeds, but whose own composition remains unchanged by the reaction. Catalysts are usually employed to accelerate reactions(positive catalyst), but retarding (negative) catalysts are also used. (Source: ALL)
	Una sostanza che accelera reazioni chimiche.
	A substance which speeds up chemical reactions.

acceleratore

Altri significati:

Someone or something that encourages progress or change.

(automotive) A catalytic converter.

(chemistry) A substance that increases the rate of a chemical reaction without being consumed in the process.