Eosin

//ˈi.əsɪn// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A red, acidic dye commonly used in histological stains. countable, uncountable

    "Thus the fluorescence of the familiar dye eosin can be excited quite well by ultra-violet or short-wave blue light, but is much better excited by visible green light with a wavelength close to that of the emitted radiation."

  2. 2
    a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures wordnet

Synonyms

All synonyms
bromeosin

Example

More examples

"A biopsy specimen was obtained and sent to Pathology where it was sectioned and stained with hematoxylin and eosin."

Etymology

Borrowed from German Eosin, coined by Heinrich Caro, from Ancient Greek ἠώς (ēṓs, “dawn”) + -in.

Related phrases

eosin Beosin Yeosinic acid

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.