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[awr-see-in] /ˈɔr si ɪn/
noun, Chemistry.
a red dye, the principal coloring matter of cudbear and orchil, obtained by oxidizing an ammoniacal solution of orcinol.
Origin of orcein
1830-40; arbitrary alteration of orcin; see orcinol Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for orcein


a brown crystalline material formed by the action of ammonia on orcinol and present in orchil: used as a dye, biological stain, and antiseptic. Formula: C28H24O7N2
Word Origin
C19: see orcinol
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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orcein in Medicine

orcein or·ce·in (ôr'sē-ĭn)
A natural dye derived from orcinol and used in various histologic staining methods as a purple dye complex.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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