eosin

[ ee-uh-sin ]

noun

, Chemistry.

1. Also called bromeosin, tetrabromofluorescein. a red, crystalline, water-insoluble solid, C 20 H 8 Br 4 O 5 , derived from fluorescein by bromination: used chiefly as an acid dye for dyeing silk a rose red color and as a histological stain.
2. any of a variety of eosinlike dyes.

eosin

/ ˈiːəʊsɪn; ˈiːəʊsɪn; -ˌsiːn /

noun

1. Also calledbromeosin a red crystalline water-insoluble derivative of fluorescein. Its soluble salts are used as dyes. Formula: C 20 H 8 Br 4 O 5
2. any of several similar dyes

Derived Forms

• ˈeosin-ˌlike, adjective
• ˌeoˈsinic, adjective

Other Words From

• eo·sinic adjective
• eo·sin·like adjective

Word History and Origins

Origin of eosin¹

1865–70; < Greek ēṓs dawn ( eo- ) + -in ²

Word History and Origins

Origin of eosin¹

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

Example Sentences

They are identified by their distinctive granules that stain red when treated with an acidic reagent, eosin, which gave them their name.

From Science Daily

Each tissue sample was stained with a pair of stains called hematoxylin and eosin—or H&E—to turn different tissue structures pink or blue.

From Scientific American

I clicked on researcher after researcher, ruling out one after another—one just because he didn’t list an e-mail or any contact information, another because she wrote articles filled with words I didn’t understand, words like pharmacognosy, methanolic, and eosin.

From Literature

On the basis of technology, the slide stainers market is segmented into hematoxylin and eosin, immunohistochemistry, in situ hybridization, cytology, microbiology, hematology, and special staining.

From Washington Times

Muscle biopsies were shipped frozen from clinical centres by liquid nitrogen dry shipping and, where possible, frozen muscle was sectioned on a cryostat and stained with haematoxylin and eosin to assess muscle quality as well as the presence of overt freeze–thaw artefacts.

From Nature