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.
to act upon by catalysis.
noun (pl) -ses (-ˌsiːz)
acceleration of a chemical reaction by the action of a catalyst
1650s, “dissolution,” from Latinized form of Greek katalysis “dissolution, a dissolving” (of governments, military units, etc.), from katalyein “to dissolve,” from kata- “down” (or “completely”), see cata-, + lyein “to loosen” (see lose). Chemical sense “change caused by an agent which itself remains unchanged” is attested from 1836, introduced by Swedish chemist Jöns Jakob Berzelius (1779-1848).
1890, back-formation from catalysis on model of analyze/analysis. Related: Catalyzed; catalyzing. Probably influenced by French catalyser (1842).
catalysis ca·tal·y·sis (kə-tāl’ĭ-sĭs)
n. pl. ca·tal·y·ses (-sēz’)
The action of a catalyst, especially an increase in the rate of a chemical reaction.
catalyze cat·a·lyze (kāt’l-īz’)
v. cat·a·lyzed, cat·a·lyz·ing, cat·a·lyz·es
To modify, especially to increase, the rate of a chemical reaction by catalysis.
To modify, especially to increase, the rate of a chemical reaction through the action of a catalyst.
Chemistry. a substance that causes or accelerates a chemical reaction without itself being affected. something that causes activity between two or more persons or forces without itself being affected. a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution. […]
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. Contemporary Examples Communications tools and political platform building workshops could be catalytic. Satellites Correctly […]
an antipollution device in an automotive exhaust system that contains a catalyst for chemically converting some pollutants in the exhaust gases, as carbon monoxide, unburned hydrocarbons, and oxides of nitrogen, into harmless compounds. noun a device using three-way catalysts to reduce the obnoxious and poisonous components of the products of combustion (mainly oxides of nitrogen, […]
the reduction of the molecular weight of hydrocarbons by a catalyst, accomplished in a petroleum refinery by a type of chemical reactor (catalytic cracker) Compare cracker (def 8), cracking (def 1).