Source : WordNet®

hilum
     n 1: (anatomy) a depression or fissure where vessels or nerves or
          ducts enter a bodily organ; "the hilus of the kidney"
          [syn: {hilus}]
     2: the scar on certain seeds marking its point of attachment to
        the funicle
     [also: {hila} (pl)]

hila
     See {hilum}