You know what it looks like… but what is it called?
TAKE THE QUIZ“diphenyl”
The following 6 entries include the term diphenyl.
: a crystalline diamine C6H5NHC6H4NH2
: any of numerous direct dyes with a diphenyl element
diphenyl ether
noundiphenyl ketone
noundiphenyl oxide
noun: phenyl ether —used chiefly commercially
symmetrical diphenyl-urea
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Merriam-Webster unabridged