Plural of diphenyl; organic compounds containing two phenyl groups, often used as heat transfer fluids and in electronic applications.
From di- (two) + phenyl (benzene-derived aromatic groups). The plural of a category of compounds that became important in mid-20th century industrial applications.
Diphenyl compounds as heat transfer fluids were crucial to early nuclear reactors and high-temperature industrial processes—they could handle extreme temperatures where water would instantly vaporize.
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