phosphonium iodide

noun Chemistry.

a colorless to slightly yellowish, crystalline, water-soluble solid, PH₄I, used in chemical synthesis.

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Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Phosphonium iodide is always a great word to know.

So is catalyst. Does it mean:

a substance that causes a chemical reaction without itself being affected

a compound of high molecular weight made by adding many smaller molecules or by condensation smaller molecules with the elimination of water or alcohol

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