ammonium sulfate

noun Chemistry.

a white, crystalline, water-soluble solid, (NH₄)₂SO₄, used chiefly as a fertilizer.

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Origin:
1800–85

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

So is lye. Does it mean:

a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide, or any solution resulting from leaching or percolation

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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American Heritage

Science Dictionary

ammonium sulfate
A brownish-gray to white crystalline salt used in fertilizers and water purification. Chemical formula: (NH₄)₂SO₄.

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