paraphenylenediamine

noun
para·​phen·​yl·​ene·​di·​amine | \ -ˌfen-ᵊl-ˌēn-ˈdī-ə-ˌmēn How to pronounce paraphenylenediamine (audio) \

Medical Definition of paraphenylenediamine

: the para isomer of phenylenediamine that is used especially in dyeing hair and sometimes causes an allergic reaction

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