from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A red crystalline powder, C20H8O5Br4, used in textile dyeing and ink manufacturing and in coloring gasoline.
  • n. The red sodium or potassium salt of this powder, used in biology to stain cells.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A red, acidic dye commonly used in histological stains.

from the GNU version of the Collaborative International Dictionary of English

  • n. A yellow or brownish red dyestuff obtained by the action of bromine on fluoresceïn, and named from the fine rose-red which it imparts to silk. It is also used for making a fine red ink. Its solution is fluorescent.

from The Century Dictionary and Cyclopedia

  • n. Tetrabromfluoresceïn (C20H8Br4O5), a valuable dye derived from coal-tar products, forming red or yellowish-red crystals.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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


from The American Heritage® Dictionary of the English Language, 4th Edition

Greek ēōs, dawn (from its color); see aus- in Indo-European roots + -in.



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  • "Van Gogh was a fan of the vivid scarlet ‘geranium lake’ pigment derived from the synthetic dye, eosin. Even at the time it was known to fade. He compensated by using it more intensely, but was ultimately unable to hold back the photochemical tide."


    May 9, 2017

  • eosin the color of dawn (the east), literally: red to (a)rose spectrum: The Hopi Language has dozens of word for dawn and its colors as indubitably many other languages do also:

    January 14, 2007