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Definition of Catalyst

Babylon English Dictionary

substance that accelerates a chemical reaction but remains unchanged by it; someone or something which provokes change
Catalyst Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

catalyst
n
1. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected [syn: accelerator]
[ant: anticatalyst]

2. something that causes an important event to happen; "the invasion acted as a catalyst to unite the country"

WordNet 2.0

Noun
1. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
(synonym) accelerator
(antonym) anticatalyst
(hypernym) activator
(hyponym) biocatalyst
(derivation) catalyze, catalyse
(classification) chemistry, chemical science
2. something that causes an important event to happen; "the invasion acted as a catalyst to unite the country"
(hypernym) causal agent, cause, causal agency
Catalyst Definition from Business & Finance Dictionaries & Glossaries
Glossary of petroleum Industry
A substance which hastens or retards a chemical reaction without undergoing a chemical change itself during the process. catalyst a substance that alters, accelerates, or instigates chemical reactions without itself being affected.
Company Info: Ticker, Name, Description
Catalyst Semiconductor, Inc.
Exchange: Nasdaq
Designs, develops and markets broad range nonvolatile semiconductor memory products which retain stored data when the system power is turned off.
Catalyst International, Inc.
Exchange: Nasdaq
Develops, markets and supports advanced warehouse management software solutions; And provides related services, including software modification and configuration, project management, rapid prototyping, training and implementation support.
Catalyst Definition from Science & Technology Dictionaries & Glossaries
Bioglossary
Description: A substance that speeds up a chemical reaction, but is not itself changed during the reaction.
Source: Specialized encyclopedia and dictionaries
© European Communities, 1995-2004
Electrochemistry Dictionary
A material that can cause catalysis.
General Chemistry Glossary
 Say it 
A substance which increases the rate of a chemical reaction without being consumed or produced by the reaction. Catalysts speed both the forward and reverse reactions, without changing the position of equilibrium . Enzymes are catalysts for many biochemical reactions.
EIA Energy Glossary
The carbonaceous residue that is deposited on and deactivates the catalyst used in many catalytic operations (e.g., catalytic cracking). Carbon is deposited on the catalyst, thus deactivating the catalyst. The catalyst is reactivated by burning off the carbon, which is used as a fuel in the refining process. That carbon or coke is not recoverable in a concentrated form.
Source: Energy Information Administration, 2006
Oil and Gas Field Glossary
A substance which aids or promotes a chemical reaction without forming part of the final product. It enables the reaction to take place faster or at a lower temperature, and remains unchanged at the end of the reaction. In industrial processes, nevertheless, the catalyst must be changed periodically to maintain economic production.
Web Dictionary of Cybernetics and Systems
A property, event or material substance that must be present to synthesize or produce some other property, event or material substance without becoming part of the result of the process. In chemistry, catalysts speed up or slow down a chemical reaction without undergoing permanent chemical change thereby. An example of a catalyst in society is the justice of peace or the priest who is necessary to legalize a marriage but does not himself participate in it. The assembly of a machine according to information carrying instructions is another example. (Krippendorff)
Catalyst Definition from Computer & Internet Dictionaries & Glossaries
TCP/IP Ports Assignments
{catalyst}
catalyst.
{catalyst}
catalyst.
TCP/IP Ports Assignments (Intrusive)
{catalyst}
catalyst.
{catalyst}
catalyst.
Catalyst Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Catalysis is the increase in the rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents in the chemical reaction, a catalyst is not consumed. With a catalyst, less free energy is required to reach the transition state, but the total free energy from reactants to products does not change. A catalyst may participate in multiple chemical transformations. The effect of a catalyst may vary due to the presence of other substances known as inhibitors or poisons (which reduce the catalytic activity) or promoters (which increase the activity). The opposite of a catalyst, a substance that reduces the rate of a reaction, is an inhibitor.

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Catalyst Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
A substance that alters the speed of a reaction, but does not change the form or amount of product. For example, Enzymes are biological catalysts, enhancing reactions within living organisms.
  A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.
Catalyst Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
torai-tukh
Catalyst Definition from Medicine Dictionaries & Glossaries
TOXICOLOGY
A substance that accelerates a reaction.
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Hepatitis Central (TM) Liver Disease Medical Glossary
Substance that causes a chemical reaction to go faster, but is not itself changed during the reaction
Substance that influences the rate of a chemical reaction without being changed in the process. Usually present in very small amounts
Aids Glossary
an agent that promotes or accelerates a chemical reaction without itself being consumed.
Aegis