Catalysis - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

ca·tal·y·sis

Audio Help [kuh-tal-uh-sis] Pronunciation Key

–noun, plural -ses

Audio Help [-seez] Pronunciation Key.

1.	Chemistry. the causing or accelerating of a chemical change by the addition of a catalyst.

2.	an action between two or more persons or forces, initiated by an agent that itself remains unaffected by the action: social catalyses occasioned by controversial writings.

[Origin: 1645–55; < NL < Gk katálȳsis dissolution, equiv. to katalȳ́(ein) to dissolve (kata- cata- + lȳ́ein to loosen) + -sis -sis

]

—Related forms

cat·a·lyt·ic

Audio Help [kat-l-it-ik] Pronunciation Key, adjective, noun

cat·a·lyt·i·cal, adjective

cat·a·lyt·i·cal·ly, adverb

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Catalysis

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American Heritage Dictionary - Cite This Source - Share This

ca·tal·y·sis Audio Help (kə-tāl'ĭ-sĭs) Pronunciation Key
n. pl. ca·tal·y·ses (-sēz')
The action of a catalyst, especially an increase in the rate of a chemical reaction.

[Greek katalusis, dissolution, from katalūein, to dissolve : kata-, intensive pref.; see cata- + lūein, to loosen; see leu- in Indo-European roots.]

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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.

WordNet - Cite This Source - Share This

catalysis
noun
acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

catalysis ca·tal·y·sis (kə-tāl'ĭ-sĭs)
n. pl. ca·tal·y·ses (-sēz')
The action of a catalyst, especially an increase in the rate of a chemical reaction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
Main Entry: ca·tal·y·sis
Pronunciation: k&-'tal-&-s&s
Function: noun
Inflected Form: plural ca·tal·y·ses /-"sEz/
: a change and especially increase in the rate of a chemical reaction induced by a catalyst

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Catalysis

Ca*tal"y*sis\, n.; pl. Catalyse.[ML., fr. Gr. ? dissolution, fr. ? to destroy, dissolve; kata` down, wholly + ? to loose.]

1. Dissolution; degeneration; decay. [R.]

Sad catalysis and declension of piety. --Evelyn.

2. (Chem.) (a) A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is apparenty left unchanged; as, the catalysis of making ether from alcohol by means of sulphuric acid; or catalysis in the action of soluble ferments (as diastase, or ptyalin) on starch. (b) The catalytic force.

On-line Medical Dictionary - Cite This Source - Share This

catalysis

catalysis: in CancerWEB's On-line Medical Dictionary

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