eosin

[ ee-uh-sin ]

/ ˈi ə sɪn /

noun Chemistry.

Also called bromeosin, tetrabromofluorescein. a red, crystalline, water-insoluble solid, C20H8Br4O5, derived from fluorescein by bromination: used chiefly as an acid dye for dyeing silk a rose red color and as a histological stain.

any of a variety of eosinlike dyes.

Nearby words

eon, eonian, eonism, eop, eos, eosin, eosine, eosinopenia, eosinophil, eosinophil adenoma, eosinophil chemotactic factor of anaphylaxis

Also e·o·sine

[ee-uh-sin, -seen] /ˈi ə sɪn, -ˌsin/.

Origin of eosin

1865–70; < Greek ēṓs dawn (see eo-) + -in²

Related formse·o·sin·ic, adjectivee·o·sin·like, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for eosine

Very good results in soap may be obtained by mixing a fast blue, as ultramarine or cobalt blue, with a red as rhodamine or eosine.
Soap-Making Manual|E. G. Thomssen
The dyes with the ponceaus are faster than those with eosine or safranine.
The Practical Ostrich Feather Dyer|Alexander Paul
Potassa turns rosolic acid and coralline from an orange-red to a bright red, while it produces no change in eosine.
Scientific American Supplement, No. 363, December 16, 1882|Various
In the latter mixture they stain really with the methylene blue salt of eosine.
Histology of the Blood|Paul Ehrlich

It affords the same reactions as eosine, but its tone is more inclined to an orange.
Scientific American Supplement, No. 363, December 16, 1882|Various

British Dictionary definitions for eosine

eosin

eosine (ˈiːəʊsɪn, -ˌsiːn)

/ (ˈiːəʊsɪn) /

noun

Also called: bromeosin a red crystalline water-insoluble derivative of fluorescein. Its soluble salts are used as dyes. Formula: C 20 H 8 Br 4 O 5

any of several similar dyes

Derived Formseosinic, adjectiveeosin-like, adjective

Word Origin for eosin

C19: from Greek ēōs dawn + -in; referring to the colour it gives to silk

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for eosine

eosin

[ ē′ə-sən ]

n.

Any of a class of red acid dyes of the xanthene group used as cytoplasmic stains and as counterstains, especially the sodium and potassium salts of certain of these dyes.