eosin
noun
eo·sin ˈē-ə-sən 
variants or less commonly eosine
ˈē-ə-sən
-ˌsēn
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
Word History
Etymology
International Scientific Vocabulary, from Greek ēōs dawn
First Known Use
1866, in the meaning defined at sense 1
Medical Definition
eosin
noun
eo·sin ˈē-ə-sən
variants also eosine
-sən -ˌsēn
-ˌsēn 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
- counterrotating propeller
- counterrotation
- counters
- countersalient
- countersank
- counterscarp
- counterscarps
- countersea
- counterseal
- countersecure
- counterselection
- countersense
- countershading
- countershadings
- countershaft
- countershafting
- countershafts
- countershot
- countershots
- countersign
- countersignature
- countersignatures
- countersigned
- countersigning
- countersigns