phenylenediamine
noun
phe·nyl·ene·di·amine
| \ ˈfen-ᵊl-ˌēn-ˈdī-ə-ˌmēn, ˈfēn-
\
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Medical Definition of phenylenediamine
: any of three toxic isomeric crystalline compounds C6H8N2 that are derivatives of benzene containing two amino groups attached to carbon atoms in the ortho, meta, or para positions — see quinoxaline