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[kuh-tal-uh-sis] /kəˈtæl ə sɪs/

noun, plural catalyses
[kuh-tal-uh-seez] /kəˈtæl əˌsiz/ (Show IPA)
Chemistry. the causing or accelerating of a chemical change by the addition of a .
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.
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).

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.


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