Definition of eosin in English:


Syllabification: e·o·sin
Pronunciation: /ˈēəsin


  • A red fluorescent dye that is a bromine derivative of fluorescein, or one of its salts or other derivatives.
    More example sentences
    • The sections were then counterstained in eosin, dehydrated, cleared, and mounted with glass coverslips.
    • The sections were counterstained with hematoxylin and eosin.
    • Eosin Y is an anionic or acid dye in spite of the fact that a solution of the sodium salt of eosin is basic in reaction.


late 19th century: from Greek ēōs 'dawn' + -in1.

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