| Title | Catalyst |
|---|---|
| Text | Merriam-Webster's Collegiate Dictionary English Etymology catalyst 1902, formed in Eng. (on analogy of analyst) from Gk. kata "down" + -lysis "a loosening" (comb. form); see lose. Oxford Advanced Learner's Dictionary-牛津双解-OALD7 catalyst cata·lyst / 5kAtElist / noun1. (chemistry 化) a substance that makes a chemical reaction happen faster without being changed itself 催化剂 2. ~ (for sth) a person or thing that causes a change 促使变化的人；引发变化的因素: I see my role as being a catalyst for change. 我认为我的角色是促成变革。 OLT catalyst noun ⇨ medium Webster's Third New International Dictionary, Unabridged Search result show the entry is found in: negative catalyst , or ziegler catalyst , or copper chromite catalyst , or fluid catalyst cat·a·lyst \ˈkad.ələ̇st, -atəl-\ noun (-s) Etymology: from catalysis, probably after English analysis: analyst 1. : a substance that brings about catalysis and that may or may not actually take part chemically in the reaction; broadly : any substance (as an enzyme) that initiates a reaction and enables it to take place under milder conditions (as at a lower temperature) than in the absence of the catalyst — compare biocatalyst 2. : an agent that provokes or precipitates catalysis < the housing program is intended to become the catalyst of the new French economy — Edmond Taylor > < the major catalyst in his writing life has been the Mississippi countryside — C.H.Baker > < he was rumored to be the catalyst in a native uprising — H.W.Wind > |
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