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Calabar bean

One entry found for Calabar bean.
Main Entry: Cal·a·bar bean
Pronunciation: 'ka-l&-"bär-
Function: noun
Etymology: Calabar, Nigeria
: 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