It required a certain amount of scientific education to perceive that the grey scale of the Thing was no common oxide, that the yellowish-white metal that gleamed in the crack between the lid and the cylinder had an unfamiliar hue.
There are no more uses of "oxide" in the book.
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Nitrogen oxides spewed from power plants contribute to acid rain.
The study found that premature babies given nitric oxide with their oxygen were healthier.