hem·or·rhag·in or chiefly Brit haem·or·rhag·in .hem-ə-'raj-ən n a toxic substance occurring usu. as a component of various snake venoms and capable of destroying the blood cells and the walls of small blood vessels compare HEMOLYSIN
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hem·or·rha·gin (hem″ə-raґjin) a cytolysin existing in certain venoms and poisons, such as snake venom and ricin, which is destructive to endothelial cells and blood vessels. Cf. endotheliotoxin.Medical dictionary. 2011.