noun Chemistry.
a reddish, crystalline, anthraquinone dye, C 1 4 H 5 O 2 (OH) 3 , isomeric with flavopurpurin.

1830–40; < Latin purpur(a) purple + -in2

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World English Dictionary
purpurin (ˈpɜːpjʊrɪn)
a red crystalline compound used as a stain for biological specimens; 1,2,4-trihydroxyanthraquinone. Formula: C14H5O2(OH)3
[C19: from Latin purpurapurple + -in]

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Medical Dictionary

purpurin pur·pu·rin (pûr'pyə-rĭn')
A reddish crystalline compound used as a biological stain.

The American Heritage® Stedman's Medical Dictionary
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