different between biphenyl vs diphenanthrene

English

bi- +? phenyl

biphenyl (countable and uncountable, plural biphenyls)

(organic chemistry, uncountable) A colourless solid hydrocarbon, C₁₂H₁₀, consisting of two benzene rings linked together by a single bond
(organic chemistry, countable) Any substituted or otherwise altered version of biphenyl, such as PCBs
halogenated biphenyls

di- +? phenanthrene

diphenanthrene (uncountable)

(organic chemistry) Any of several isomeric aromatic hydrocarbons, analogous to biphenyl, formed from two phenanthrene moieties joined by a single bond

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