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Definition of Phenoxazine
1. Noun. (organic compound) A tricyclic heterocycle consisting of two benzene rings fused to oxazine ¹
¹ Source: wiktionary.com
Medical Definition of Phenoxazine
1. Phenothiazine in which S is replaced by O; as the 3-oxo derivative (phenoxazone), phenoxazine is the chromophore of actinomycins. (05 Mar 2000)