Definition of: ouabain

(wä·bä′in) noun Chem.
A white, lustrous, extremely poisonous, crystalline glycoside, C₂₉H₄₄O₁₂, derived from two South African trees (Strophanthus glaber and Acokanthera ouabaio): used in medicine as a cardiac stimulant. It is a constituent of Zulu arrow poison. [<F ouabaio, a South African tree (<Somali native name) + -IN]