from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Chemistry A substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process.
- noun One that precipitates a process or event, especially without being involved in or changed by the consequences.
from The Century Dictionary.
- noun In physical chemistry Same as
catalytic agent(which see).
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) a substance that initiates or accelerates a chemical reaction without itself being affected.
- noun something that serves as a precipitating occasion for an event.
- noun something or someone that causes events to happen with itself being changed.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry A
substancethat increases the rateof a chemical reactionwithout being consumedin the process.
- noun Someone or something that
encourages progressor change.
- noun automotive A
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun something that causes an important event to happen
- noun (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
From catalysis + -ist.
Sorry, no example sentences found.