Etymology
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oxidation (n.)

"act or process of combining or causing to combine with oxygen," 1791, from French oxidation (1787), coined by French chemists Louis-Bernard Guyton de Morveau and Antoine Lavoisier, noun of action from oxider "oxidize," from oxide (see oxide).

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oxidant (n.)

"an oxidizing agent," 1859, from French oxidant (1806), from oxider "oxidize" (see oxidation).

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formaldehyde (n.)
pungent gas formed by oxidation of methyl alcohol, 1869, a contraction of formic aldehyde; see formic + aldehyde. Discovered in 1863 by German chemist August Wilhelm von Hofmann (1818-1892).
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hypo- 
word-forming element meaning "under, beneath; less, less than" (in chemistry, indicating a lesser oxidation), from Greek hypo (prep. and adverb) "under, beneath; up from under; toward and under (i.e. into)," from PIE root *upo "under."
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aldehyde (n.)

first oxidation product of alcohol, 1833, discovered in 1774 by German-born Swedish chemist Carl Wilhelm Scheele, the name said to have been coined by German chemist Justus von Liebig from abbreviation of Modern Latin alcohol dehydrogenatum "dehydrogenated alcohol." Related: Aldehydic.

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