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 the Appendix of Indo-European roots.]
cat′a·lytic (kăt′l-ĭtĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.