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Definition of Orcein
1. n. A reddish brown amorphous dyestuff, &?;, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus.
Definition of Orcein
1. Noun. (chemistry) a dye, related to litmus, that is extracted from the lichen ''Rocella tinctoria''; used as a microscopic stain and as a food colouring ¹
¹ Source: wiktionary.com
Definition of Orcein
1. a reddish brown dye [n -S]
Medical Definition of Orcein
1.