Dictionary![]() ![]() or•ce•inPronunciation: (ôr'sē-in), [key] —n. Chem. a red dye, the principal coloring matter of cudbear and orchil, obtained by oxidizing an ammoniacal solution of orcinol. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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