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Definition of Semiquinone
1. Noun. (chemistry) An intermediate free radical generated in the conversion of quinones to/from hydroquinones. ¹
¹ Source: wiktionary.com
Medical Definition of Semiquinone
1. A free radical resulting from the removal of one hydrogen atom with its electron during the process of dehydrogenation of a hydroquinone to quinone or similar compound (e.g., flavin mononucleotide). (05 Mar 2000)