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paraphenylenediamine

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noun para·phen·yl·ene·di·amine \-ˌfen-əl-ˌēn-ˈdī-ə-ˌmēn\

Medical Definition of paraphenylenediamine

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

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