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lnoun
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Catalyst
is a GRE word you need to know.
So is gregarious. Does it mean:
| to expose to public derision, ridicule, or abuse |
| seeking and enjoying the company of others |
Collins
World English Dictionary
| catalyst (ˈkætəlɪst) | |
| —n | |
| 1. | Compare inhibitor a substance that increases the rate of a chemical reaction without itself suffering any permanent chemical change |
| 2. | a person or thing that causes a change |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
catalyst
1902, formed in Eng. (on analogy of analyst) from Gk. kata "down" + -lysis "a loosening" (comb. form); see lose.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
catalyst cat·a·lyst (kāt'l-ĭst)
n.
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.
cat'a·lyt'ic (kāt'l-ĭt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
catalyst  (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. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
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.”
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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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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