RhymeZone: biphenyl definitions

Definitions of biphenyl:

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

(Definitions from Wiktionary)

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