nitrophenol

[nahy-truh-fee-nawl, -nol]

ni·tro·phe·nol

[nahy-truh-fee-nawl, -nol]
noun Chemistry.
1.
any compound derived from phenol by the replacement of one or more of its ring hydrogen atoms by the nitro group.
2.
any of three water-soluble, crystalline isomers of such a derivative, having the formula C6H5NO3, occurring in yellow (ortho-nitrophenol), pale-yellow (meta-nitrophenol), and yellowish (para-nitrophenol) solids, used chiefly as intermediates in organic synthesis and as indicators.

Origin:
1850–55; nitro- + phenol
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Nitrophenol is always a great word to know.
So is alum. Does it mean:
a double sulfate analogous to potassium alum, as aluminum ammonium sulfate, with the formula R2SO4?X2(SO4)3?24H2O, where R is alkali metal or ammonium
to remove impurities from a gas by chemical means, as sulfur dioxide from smokestack gas or carbon dioxide from exhaled air in life-support packs
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