eosin

noun

eo·sin ˈē-ə-sən

variants or less commonly eosine

ˈē-ə-sən

-ˌsēn

: 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

: any of several dyes related to eosin

Etymology

International Scientific Vocabulary, from Greek ēōs dawn

First Known Use

1866, in the meaning defined at sense 1

Time Traveler

The first known use of eosin was in 1866

See more words from the same year

Style

“Eosin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eosin. Accessed 30 Nov. 2024.

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eosin

noun

eo·sin ˈē-ə-sən

variants also eosine

-sən

-ˌsēn

: 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

: any of several dyes related to eosin

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