Calabar bean
noun
Cal·a·bar bean
ˈka-lə-ˌbär- 
: 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
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“Calabar bean.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Calabar%20bean. Accessed 30 Oct. 2025.
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Calabar bean
noun
Cal·a·bar bean
ˈkal-ə-ˌbär-
: 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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