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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
cat·a·lyst    Audio Help   [kat-l-ist] Pronunciation Key
–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.

[Origin: 1900–05; cataly(sis) + (-i)st]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
catalyst

To learn more about catalyst visit Britannica.com

© 2008 Encyclopædia Britannica, Inc.
American Heritage Dictionary - Cite This Source - Share This
cat·a·lyst    Audio Help   (kāt'l-ĭst)  Pronunciation Key 
n.  
  1. Chemistry 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.
  2. One that precipitates a process or event, especially without being involved in or changed by the consequences: "A free press ... has remained ... a vital catalyst to an informed and responsible electorate" (Robert O'Neal).


[From catalysis.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Online Etymology Dictionary - Cite This Source - Share This
catalyst 
1902, formed in Eng. (on analogy of analyst) from Gk. kata "down" + -lysis "a loosening" (comb. form); see lose.

Online Etymology Dictionary, © 2001 Douglas Harper
WordNet - Cite This Source - Share This
catalyst

noun
1. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected [ant: anticatalyst
2. something that causes an important event to happen; "the invasion acted as a catalyst to unite the country" 

WordNet® 3.0, © 2006 by Princeton University.
Kernerman English Multilingual Dictionary - Cite This Source - Share This
catalyst1 [kӕtəlist] noun
a substance which causes or assists a chemical change in another substance without itself undergoing any permanent chemical change
Arabic: مادَّةٌ حَفّازَه
Chinese (Simplified): 催化剂
Chinese (Traditional): 催化劑
Czech: katalyzátor
Danish: katalysator
Dutch: katalysator
Estonian: katalüsaator
Finnish: katalysaattori
French: catalyseur
German: der Katalysator
Greek: καταλύτης
Hungarian: katalizátor
Icelandic: hvati
Indonesian: katalisator
Italian: catalizzatore
Japanese: 触媒
Korean: 촉매
Latvian: katalizators
Lithuanian: katalizatorius
Norwegian: katalysator
Polish: katalizator
Portuguese (Brazil): catalisador
Portuguese (Portugal): catalizador
Romanian: catalizator
Russian: катализатор
Slovak: katalyzátor
Slovenian: katalizator
Spanish: catalizador
Swedish: katalysator
Turkish: katalizör
catalyst2 [kӕtəlist] noun
someone or something that helps bring about a change
Arabic: حَفّاز، مُحَفِّز
Chinese (Simplified): 促进
Chinese (Traditional): 促進
Czech: katalyzátor
Danish: igangsætter; drivkraft; katalysator
Dutch: katalysator
Estonian: abivahend
Finnish: katalysaattori
French: catalyseur
German: der Beschleuniger
Greek: καταλύτης (μτφ.)
Hungarian: katalizátor
Icelandic: hvatamaður, hvati
Indonesian: pencetus
Italian: catalizzatore
Japanese: 触媒の役をするもの
Korean: 남에게 감화를 주는 것
Latvian: katalizators
Lithuanian: kas pagreitina permainas
Norwegian: katalysator
Polish: osoba, *rzecz funkcjonująca jako `katalizator`
Portuguese (Brazil): catalisador
Portuguese (Portugal): catalizador
Romanian: catalizator
Russian: катализатор
Slovak: katalyzátor
Slovenian: katalizator
Spanish: catalizador
Swedish: katalysator
Turkish: neden, sebep
Kernerman English Multilingual Dictionary, © 2000-2006 K Dictionaries Ltd.
The American Heritage Science Dictionary - Cite This Source - Share This
catalyst    Audio Help   (kāt'l-ĭst)  Pronunciation Key 
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.

catalytic adjective (kāt'l-ĭt'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
catalyst [(kat-uh-list)]

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

Note: The term catalyst is often used to refer to the prime agent of any change: “She was the catalyst for the reorganization.”

[Chapter:] Physical Sciences and Mathematics


The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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