from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
- n. One that precipitates a process or event, especially without being involved in or changed by the consequences: "A free press ... has remained ... a vital catalyst to an informed and responsible electorate” ( Robert O'Neal).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance that increases the rate of a chemical reaction without being consumed in the process.
- n. Someone or something that encourages progress or change.
- n. A catalytic converter.
from the GNU version of the Collaborative International Dictionary of English
- n. a substance that initiates or accelerates a chemical reaction without itself being affected.
- n. something that serves as a precipitating occasion for an event.
- n. something or someone that causes events to happen with itself being changed.
from The Century Dictionary and Cyclopedia
- n. In physical chemistry Same as catalytic agent (which see).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. something that causes an important event to happen
- n. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
From catalysis.(American Heritage® Dictionary of the English Language, Fourth Edition)
From catalysis + -ist. (Wiktionary)