n., pl., -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.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
