or chiefly Brit  hy*po*pro*throm*bin*ae*mia  n :  deficiency of prothrombin in the blood usu. due to vitamin K deficiency or liver disease (esp. obstructive jaundice) and resulting in delayed clotting of blood or spontaneous bleeding (as from the nose or into the skin) - called also prothrombinopenia  hy*po*pro*throm*bin*emic or chiefly Brit  hy*po*pro*throm*bin*ae*mic  adj 
 
 
 
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