Definition of "naphthoquinone" []

• Either of two isomers of polycyclic aromatic ketones derived from naphthalene. (noun)

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• "In the very same year Doisy reported that, together with his associates, he had succeeded not only in determining the chemical structure of vitamin K - it was found to be a naphthoquinone derivate - but also in synthetically preparing in his laboratory a K vitamin identical with the natural one."
• "Within this naphthoquinone category, there are two basic types of vitamin K."
• "The anti-vitamin K activity was thought to be associated with the hydroxyl group attached to the naphthoquinone ring ofthe compound."