abrinChem.|ˈeɪbrɪn|[f.mod.L. Abrus(seedef.)+ -in¹.]A highly poisonous proteid contained in the jequirity bean (Abrus precatorius).1884KleinMicro-org. & Disease 165Messrs. Warden and Waddell published in Calcutta during the present year..a large number of observations on the jequirity poison... They have..proved, that the active principle is a proteid—abrin—closely allied to native albumen.1897[see phytalbumose].