lead dioxide

[led]

lead dioxide

[led]
noun Chemistry.
a brown crystalline compound, PbO2, toxic, insoluble in water and alcohol, soluble in glacial acetic acid: used as an oxidizing agent, in lead-acid batteries, and in analytical chemistry.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Lead dioxide is always a great word to know.
So is melamine. Does it mean:
a white, crystalline, slightly water-soluble solid, C3N3(NH2)3, used chiefly in organic synthesis and in the manufacture of resins
having an unsymmetrical arrangement of atoms in a molecule, or noting a carbon atom bonded to four different atoms or groups
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