eosin eoside • eosinate · · · Info · Definitions · Synonyms · Characters · · eosin · · Text Latin · · Script 5 · · Length Definitions · · · (noun) a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures. Synonyms: bromeosin. · · Noun Definition 1 Synonyms · · · bromeosin · · Synonym 1 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073