define hilar lymph node
hilum of lymph node. Definitions: 1. the depressed area of the surface of a lymph node through which the efferent lymphatics emerge from the medulla and through which blood vessels enter and leave the node.Synonyms: hilum nodi lymphoidei.The definition information for hilum of lymph node is provided by Stedman's.efinitions: 1. the depressed area of the surface of a lymph node through which the efferent lymphatics emerge from the medulla and through which blood vessels enter and leave the node. Synonyms: hilum nodi lymphoidei. The definition information for hilum of lymph node is provided by Stedman's.