catalysis

[kuh-tal-uh-sis]
|

noun, plural ca·tal·y·ses [kuh-tal-uh-seez] /kəˈtæl əˌsiz/.

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

Nearby words

  1. catalonia,
  2. catalonian,
  3. catalpa,
  4. catalufa,
  5. catalyse,
  6. catalyst,
  7. catalytic,
  8. catalytic converter,
  9. catalytic cracker,
  10. catalytic cracking

Origin of catalysis

1645–55; < New Latin < Greek katálȳsis dissolution, equivalent to katalȳ́(ein) to dissolve (kata- cata- + lȳ́ein to loosen) + -sis -sis

Related forms
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for catalytic


British Dictionary definitions for catalytic

catalytic

adjective

of or relating to catalysis; involving a catalyst
Derived Formscatalytically, adverb

catalysis

noun plural -ses (-ˌsiːz)

acceleration of a chemical reaction by the action of a catalyst

Word Origin for catalysis

C17: from New Latin, from Greek katalusis, from kataluein to dissolve

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for catalytic
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for catalytic

catalysis

[kə-tălĭ-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.

Science definitions for catalytic

catalyst

[kătl-ĭst]

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.
Related formscatalytic adjective (kăt′l-ĭtĭk)

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.