Definition of Calabar bean
: the dark brown highly poisonous leguminous seed of a tropical west African woody vine (Physostigma venenosum) that is used as a source of physostigmine and was used formerly as an ordeal poison in African witchcraft trials
Origin of calabar bean
First Known Use: 1864
Medical Definition of Calabar bean
: the dark brown poisonous seed of a tropical African woody vine of the genus Physostigma (P. venenosum) that is used as a source of physostigmine
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