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eosin One of a series of acidic dyes, used in optical microscopy, that colours cytoplasm pink and cellulose red. It is frequently used as a counterstain with haematoxylin for colouring tissue smears and sections of animal tissue.

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eosin (ee-oh-sin) n. a red acidic dye, produced by the reaction of bromine and fluorescein, used to stain biological specimens for microscopical examination.