American Heritage® Dictionary of the English Language, Fourth Edition
- n. See Calabar bean.
- n. The Calabar bean.
GNU Webster's 1913
- n. (Bot.) See Calabar bean, under Calabar.
- n. dark brown highly poisonous seed of the calabar-bean vine; source of physostigmine and used in native witchcraft
- It was formerly used by the natives in trials for witchcraft. (Wiktionary)
- So called from its alleged use as a test for witchcraft. (American Heritage® Dictionary of the English Language, Fourth Edition)
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