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1. A yellowish-red crystalline powder, C20H8 Br4O5, used in textile dyeing and ink manufacturing, as a biological stain, and in coloring gasoline.
2. Any of a group of red fluorescent bromine derivatives of fluorescein, or their sodium or potassium salts, used in ink manufacturing, textile dyeing, and in biology to stain cells.

[Greek ēōs, dawn (from its color); see aus- in Indo-European roots + -in.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈiːəʊsɪn) or


1. (Elements & Compounds) Also called: bromeosin a red crystalline water-insoluble derivative of fluorescein. Its soluble salts are used as dyes. Formula: C20H8Br4O5
2. (Dyeing) any of several similar dyes
[C19: from Greek ēōs dawn + -in; referring to the colour it gives to silk]
ˌeoˈsinic adj
ˈeosin-ˌlike adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈi ə sɪn)

also e•o•sine

(-sɪn, -ˌsin)

1. a red, crystalline, water-insoluble solid, C20H8Br4O5, used chiefly as an acid dye for silk and as a histological stain.
2. any of a variety of similar dyes.
[1865–70; < Greek ēṓs dawn (see eo-) + -in1]
e`o•sin′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.eosin - a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures
fluorescein, fluoresceine, fluorescent dye, resorcinolphthalein - a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


n. eosina, sustancia insoluble usada como colorante rojo en algunos tejidos que se estudian bajo el microscopio.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
In this perspective photocatalytic efficacy of organometallic ruthenium and eosin Y have been investigated in connection to their pursuit for the photocatalytic oxidative coupling of N-aryl tetrahydroisoquinoline with carbon and sulfur containing nucleophiles.
Key Words: Photoredox catalyst, Tris (bipyridine) ruthenium (II) chloride, Eosin Y, Tetrahydroisoquinoline
Keeping in view the identical photochemical properties of organic dyes and transition metal complexes in various synthetic transformations [20], the present studies describes the photocatalytic efficiency of ruthenium tris-(bipyridine) chloride and eosin Y for the facile construction of C-C and C-S bonds employing the N-aryl tetrahydroisoquinolines as the target substrates.
Based on the COSY results in Figure 9 and the DOSY results in Figure 10, caffeine and eosin Y are not reacting to form a new molecule.
UV-Vis spectra were obtained at 0.75 [micro]M eosin Y and mixtures of 0.75 [micro]M eosin Y and caffeine at various concentrations (from 0.42 mM to 11.25 mM) in 400 mM dibasic potassium phosphate solution are shown in Figure 11.
The researcher was able to stain the prepared slides with Eosin Y. Slides stained with Eosin Y were used to examine the health of the cartilage.