| orchella | 1. A violet dye obtained from several species of lichen (Roccella tinctoria, etc), which grow on maritime rocks in the Canary and Cape Verd Islands, etc. 2. The plant from which the dye is obtained. Alternative forms: orchal and orchil. Origin: OF. Orchel, orcheil, It. Orcella, oricello, or OSp. Orchillo. Cf. Orchil. Source: Websters Dictionary (01 Mar 1998) |
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| orchella |
a histologic stain composed of 5 mL of acetic acid and 40 mL each of alcohol and water, colored to a dark red with archil from which excess of ammonia has been driven off.
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