[ kuh-tal-uh-sis ]
/ kəˈtæl ə sɪs /

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.

Origin of catalysis

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

OTHER WORDS FROM catalysis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for catalytic

British Dictionary definitions for catalytic (1 of 2)

/ (ˌkætəˈlɪtɪk) /


of or relating to catalysis; involving a catalyst

Derived forms of catalytic

catalytically, adverb

British Dictionary definitions for catalytic (2 of 2)

/ (kəˈtælɪsɪs) /

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

Medical definitions for catalytic

[ 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.

Scientific definitions for catalytic

[ 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.

Other words from catalyst

catalytic adjective (kăt′l-ĭtĭk)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.