-ˈdīəˌmēn noun
Etymology: diimine from di- + imine
1. : a colorless crystalline compound HN . C 6 H 4 . NH regarded as derived from quinone (sense 1a) by replacement of both oxygen atoms by imino groups but made by oxidation of para -phenylenediamine — called also p-benzoquinone diimine, p-quinone diimine
2. : a compound derived from a quinone by replacement of both oxygen atoms by imino groups