purpurin

noun
pur·​pu·​rin | \ ˈpər-pyə-rən How to pronounce purpurin (audio) \

Medical Definition of purpurin

1 : an orange or red crystalline compound C14H8O5 obtained from madder root along with alizarin or by oxidation of alizarin and used in dyeing
2 also purpurine \ -​rən, -​ˌrēn How to pronounce purpurine (audio) \ : any of various colored compounds obtained from chlorophyll or related compounds by the action of cold alcoholic alkali and oxygen

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