phenoxazine
/fiːˈnɒksəziːn/ /fɪˈnɒksəziːn/Chemistry
noun
A violet-red, crystalline, heteroaromatic compound, C12H9NO, whose tricyclic molecule contains two benzene rings joined by an oxygen atom and an imino group, and which is used in the preparation of oxazine dyes; any of a class of compounds whose molecules contain this structure.
Origin
Late 19th century; earliest use found in Thomas E. Thorpe (1845–1925), chemist. From pheno- + oxazine, after German Phenoxazin.