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From The Collaborative International Dictionary of English v.0.48:
Calabar \Cal"a*bar\, n. A district on the west coast of Africa. [1913 Webster] Calabar bean, The of a climbing legumious plant (Physostigma venenosum), a native of tropical Africa. It is highly poisonous. It is used to produce contraction of the pupil of the eye; also in tetanus, neuralgia, and rheumatic diseases; -- called also ordeal bean, being used by the negroes in trials for witchcraft. [1913 Webster]