Definition of orcein in English:

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Pronunciation: /ˈôrsēin/


A red dye obtained from orchil, used as a stain in microscopic study.
Example sentences
  • The chromosomes were stained with acetic orcein and visualized with a light microscope.
  • Chromosomes were counted in root tips stained with acetic orcein.
  • The slide was immersed in 1% orcein in 45% acetic acid for 15 min, washed in distilled water, air-dried and a coverslip was mounted in Histomount (National Diagnostics, Hull, UK).


Mid 19th century: alteration of orcin, another name for orcinol.

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