What's the difference between archil and orchil?

Archil

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Definition:

• (n.) 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.
• (n.) The plant from which the dye is obtained.

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Orchil

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Definition:

• (n.) See Archil.

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