eosin

noun
eo·​sin | \ˈē-ə-sən \
variants: or less commonly eosine \ ˈē-​ə-​sən , -​ˌsēn \

Definition of eosin 

1 : a red fluorescent dye C20H8Br4O5 obtained by the action of bromine on fluorescein and used especially in cosmetics and as a toner also : its red to brown sodium or potassium salt used especially as a biological stain for cytoplasmic structures

2 : any of several dyes related to eosin

First Known Use of eosin

1866, in the meaning defined at sense 1

History and Etymology for eosin

International Scientific Vocabulary, from Greek ēōs dawn

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Time Traveler for eosin

The first known use of eosin was in 1866

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More Definitions for eosin

eosin

noun
eo·​sin | \ˈē-ə-sən \
variants: also eosine \ -​sən , -​ˌsēn \

Medical Definition of eosin 

1 : a red fluorescent dye C20H8Br405 obtained by the action of bromine on fluorescein and used especially in cosmetics and as a toner also : its red to brown sodium or potassium salt used especially as a biological stain for cytoplasmic structures

2 : any of several dyes related to eosin

More from Merriam-Webster on eosin

Britannica.com: Encyclopedia article about eosin

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