portal vein       
noun [ C usually singular ]  anatomy specialized uk/ˈpɔː.təl ˌveɪn/ us/ˈpɔːr.t̬əl ˌveɪn/ (also hepatic portal vein)
 门静脉(这种静脉将血液从小肠运输到肝脏,血液中含有从食物所吸收的物质)
the vein (= tube) that carries blood, containing substances obtained from food, from the intestines to the liver
  A clot had formed in the portal vein.
 Most of the healthy liver cells will not be affected because they get their blood supply from the portal vein. 
 - More examples
 - The nutritive materials that are carried to the liver by the portal vein are dehydrated by that organ.
 - In portal hypertension, the liver cannot accept all of the fluid from the portal vein.
 - Ultrasound may show both hepatic veins and portal veins and occasionally demonstrates intravascular tumour.