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Either of two red dyes that are chlorinated derivatives of eosin and are used as biological stains; dichlorotetrabromofluorescein, C₂₀ H₆ Br₄ Cl₂ O₅, and tetrachlorotetrabromofluorescein, C₂₀ H₄ Br₄ Cl₄ O₅.
"phloxine B" noun the disodium salt of tetrachlorotetrabromofluorescein.
Late 19th century. From ancient Greek ϕλόξ flame + -ine, after German Phloxin.